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#1
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tile vent for low pitch roof
Turns out BCO is being fussy about the roof. So, I need to compy
completely with the regs, fitting instructions etc. Roof pitch is around 11 degrees, BCO has OK'd interlocking forticrete centurion tiles for this, which are spec'd down to 10 degress in a monopitch roof. But the orignal spec is for eaves and high level tile vents in the roof. Building regs say for pitches less than 15 degrees, a high level tile vent should be used providing equivalent of 5mm opening along the ridge. Its a monopitch roof but joining to neighbours monopitch roof with a wet-fixed ridge tile. So cannot have ridge ventilation easily, and abutment vents are suitable (not a lean-to). Now, all suitable vent tiles I can find are only spec'd to 20 degrees. So, how can I vent the roof ? Simon. |
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#2
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tile vent for low pitch roof
On Mon, 18 May 2009 08:07:22 -0700 (PDT), a certain chimpanzee,
sm_jamieson randomly hit a keyboard and produced: Turns out BCO is being fussy about the roof. So, I need to compy completely with the regs, fitting instructions etc. Roof pitch is around 11 degrees, BCO has OK'd interlocking forticrete centurion tiles for this, which are spec'd down to 10 degress in a monopitch roof. But the orignal spec is for eaves and high level tile vents in the roof. Building regs say for pitches less than 15 degrees, a high level tile vent should be used providing equivalent of 5mm opening along the ridge. Its a monopitch roof but joining to neighbours monopitch roof with a wet-fixed ridge tile. So cannot have ridge ventilation easily, and abutment vents are suitable (not a lean-to). Now, all suitable vent tiles I can find are only spec'd to 20 degrees. So, how can I vent the roof ? Use breathable felt. -- Hugo Nebula "If no one on the Internet wants a piece of this, just how far from the pack have you strayed?" |
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#3
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tile vent for low pitch roof
On 18 May, 17:18, Hugo Nebula abuse@localhost wrote:
On Mon, 18 May 2009 08:07:22 -0700 (PDT), a certain chimpanzee, sm_jamieson randomly hit a keyboard and produced: Turns out BCO is being fussy about the roof. So, I need to compy completely with the regs, fitting instructions etc. Roof pitch is around 11 degrees, BCO has OK'd interlocking forticrete centurion tiles for this, which are spec'd down to 10 degress in a monopitch roof. But the orignal spec is for eaves and high level tile vents in the roof. Building regs say for pitches less than 15 degrees, a high level tile vent should be used providing equivalent of 5mm opening along the ridge. Its a monopitch roof but joining to neighbours monopitch roof with a wet-fixed ridge tile. So cannot have ridge ventilation easily, and abutment vents are suitable (not a lean-to). Now, all suitable vent tiles I can find are only spec'd to 20 degrees. So, how can I vent the roof ? Use breathable felt. -- That's one option, although lots of people think it doesn't really work, and since the roof pitch is so low, I was going to rely on the underlay as a waterproofing backup, so preferred impermeable underlay. I suppose I could add some gable vents although a boiler terminal will be there, so this may not be possible. However, I also need to vent an extractor fan through the roof, so still need to find suitable vent terminals for this (cowl vents ?). I could use a cowl vent to vent the roof I guess, since they are available for flat roofs, but a row of mushrooms may look a bit funny ! Cheers, Simon. |
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#4
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tile vent for low pitch roof
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#6
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tile vent for low pitch roof
On 18 May, 16:07, sm_jamieson wrote:
Turns out BCO is being fussy about the roof. So, I need to compy completely with the regs, fitting instructions etc. Roof pitch is around 11 degrees, BCO has OK'd interlocking forticrete centurion tiles for this, which are spec'd down to 10 degress in a monopitch roof. But the orignal spec is for eaves and high level tile vents in the roof. Building regs say for pitches less than 15 degrees, a high level tile vent should be used providing equivalent of 5mm opening along the ridge. Its a monopitch roof but joining to neighbours monopitch roof with a wet-fixed ridge tile. So cannot have ridge ventilation easily, and abutment vents are suitable (not a lean-to). Now, all suitable vent tiles I can find are only spec'd to 20 degrees. So, how can I vent the roof ? Simon. How about cross battening and fit soffit/ facia vents along the 2 gable sides? |
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#7
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tile vent for low pitch roof
On 19 May, 13:32, wrote:
On 18 May, 16:07, sm_jamieson wrote: Turns out BCO is being fussy about the roof. So, I need to compy completely with the regs, fitting instructions etc. Roof pitch is around 11 degrees, BCO has OK'd interlocking forticrete centurion tiles for this, which are spec'd down to 10 degress in a monopitch roof. But the orignal spec is for eaves and high level tile vents in the roof. Building regs say for pitches less than 15 degrees, a high level tile vent should be used providing equivalent of 5mm opening along the ridge. Its a monopitch roof but joining to neighbours monopitch roof with a wet-fixed ridge tile. So cannot have ridge ventilation easily, and abutment vents are suitable (not a lean-to). Now, all suitable vent tiles I can find are only spec'd to 20 degrees. So, how can I vent the roof ? Simon. How about cross battening and fit soffit/ facia vents along the 2 gable sides? Thinking about it again, why not make it a "warm roof" and fit the insulation on top of the rafters e.g. Superquilt. I think (but not 100% sure) that you don't need vents for this but I could be wrong... |
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#8
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tile vent for low pitch roof
On 19 May, 13:32, wrote:
On 18 May, 16:07, sm_jamieson wrote: Turns out BCO is being fussy about the roof. So, I need to compy completely with the regs, fitting instructions etc. Roof pitch is around 11 degrees, BCO has OK'd interlocking forticrete centurion tiles for this, which are spec'd down to 10 degress in a monopitch roof. But the orignal spec is for eaves and high level tile vents in the roof. Building regs say for pitches less than 15 degrees, a high level tile vent should be used providing equivalent of 5mm opening along the ridge. Its a monopitch roof but joining to neighbours monopitch roof with a wet-fixed ridge tile. So cannot have ridge ventilation easily, and abutment vents are suitable (not a lean-to). Now, all suitable vent tiles I can find are only spec'd to 20 degrees. So, how can I vent the roof ? Simon. How about cross battening and fit soffit/ facia vents along the 2 gable sides? Interesting ideas. Problem is, there is only 1 gable, i.e. the "side" of the roof is against an existing wall. Plus I think venting with the slope of the roof is recommended in order to get the airflow. Most of the roof only has 50mm airflow in it, only the top has an apex void (a bit like a loft conversion). Cheers, Simon. |
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#9
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tile vent for low pitch roof
On 19 May, 13:37, wrote:
On 19 May, 13:32, wrote: On 18 May, 16:07, sm_jamieson wrote: Turns out BCO is being fussy about the roof. So, I need to compy completely with the regs, fitting instructions etc. Roof pitch is around 11 degrees, BCO has OK'd interlocking forticrete centurion tiles for this, which are spec'd down to 10 degress in a monopitch roof. But the orignal spec is for eaves and high level tile vents in the roof. Building regs say for pitches less than 15 degrees, a high level tile vent should be used providing equivalent of 5mm opening along the ridge. Its a monopitch roof but joining to neighbours monopitch roof with a wet-fixed ridge tile. So cannot have ridge ventilation easily, and abutment vents are suitable (not a lean-to). Now, all suitable vent tiles I can find are only spec'd to 20 degrees.. So, how can I vent the roof ? Simon. How about cross battening and fit soffit/ facia vents along the 2 gable sides? Thinking about it again, why not make it a "warm roof" and fit the insulation on top of the rafters e.g. Superquilt. *I think (but not 100% sure) that you don't need vents for this but I could be wrong... Depth and height of the roof was an issue, so a insulated deck on top would not be possible. Believe me I've considered all the options. I'll probably have to use permeable underlay and add a small vent in the apex for good measure. Cheers, Simon. |
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#10
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tile vent for low pitch roof
On 19 May, 13:46, wrote:
On 19 May, 13:37, wrote: On 19 May, 13:32, wrote: On 18 May, 16:07, sm_jamieson wrote: Turns out BCO is being fussy about the roof. So, I need to compy completely with the regs, fitting instructions etc. Roof pitch is around 11 degrees, BCO has OK'd interlocking forticrete centurion tiles for this, which are spec'd down to 10 degress in a monopitch roof. But the orignal spec is for eaves and high level tile vents in the roof. Building regs say for pitches less than 15 degrees, a high level tile vent should be used providing equivalent of 5mm opening along the ridge. Its a monopitch roof but joining to neighbours monopitch roof with a wet-fixed ridge tile. So cannot have ridge ventilation easily, and abutment vents are suitable (not a lean-to).. Now, all suitable vent tiles I can find are only spec'd to 20 degrees. So, how can I vent the roof ? Simon. How about cross battening and fit soffit/ facia vents along the 2 gable sides? Thinking about it again, why not make it a "warm roof" and fit the insulation on top of the rafters e.g. Superquilt. *I think (but not 100% sure) that you don't need vents for this but I could be wrong... Depth and height of the roof was an issue, so a insulated deck on top would not be possible. Believe me I've considered all the options. I'll probably have to use permeable underlay and add a small vent in the apex for good measure. Cheers, Simon.- Hide quoted text - - Show quoted text - I knew I read it somewhere...... Have a look at page 3..... http://www.elmbridge.gov.uk/Elmbridg...tchedroofs.pdf From memory, super quilt/ Tri-iso are only about 30mm and require a 25mm gap on top so this should only raise your roof height by about 55mm. Is this too much? If so, are the rafters spec'd to minimise height e.g. reduce gaps between them/ double them up? May be able to gain some there? |
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#11
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tile vent for low pitch roof
On 18 May, 16:07, sm_jamieson wrote:
Turns out BCO is being fussy about the roof. So, I need to compy completely with the regs, fitting instructions etc. Roof pitch is around 11 degrees, BCO has OK'd interlocking forticrete centurion tiles for this, which are spec'd down to 10 degress in a monopitch roof. But the orignal spec is for eaves and high level tile vents in the roof. Building regs say for pitches less than 15 degrees, a high level tile vent should be used providing equivalent of 5mm opening along the ridge. Its a monopitch roof but joining to neighbours monopitch roof with a wet-fixed ridge tile. So cannot have ridge ventilation easily, and abutment vents are suitable (not a lean-to). Now, all suitable vent tiles I can find are only spec'd to 20 degrees. So, how can I vent the roof ? Simon. I have now decided to increase the height of my ridge by about 225mm to get the maximum roof pitch / ceiling height I can. This means my ridge will no longer be shared with the neighbour - her roof will form an abutment onto 3 extra courses of brick above her existing monopitch ridge. Therefore, I will have a vertical area of wall that could contain airbricks to vent the roof. Only problem is that if someone in the future chose to extend her side, these could be blocked up. Is it worth the risk just to get some vents in ? I could then save money on permeable underlay. Simon. |
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#12
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tile vent for low pitch roof
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#13
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tile vent for low pitch roof
On 21 May, 09:14, Hugo Nebula abuse@localhost wrote:
On Wed, 20 May 2009 01:52:26 -0700 (PDT), a certain chimpanzee, randomly hit a keyboard and produced: I have now decided to increase the height of my ridge by about 225mm to get the maximum roof pitch / ceiling height I can. This means my ridge will no longer be shared with the neighbour - her roof will form an abutment onto 3 extra courses of brick above her existing monopitch ridge. Therefore, I will have a vertical area of wall that could contain airbricks to vent the roof. Only problem is that if someone in the future chose to extend her side, these could be blocked up. Is it worth the risk just to get some vents in ? I could then save money on permeable underlay. If you're now increasing the roof pitch, you could get the tile vents in that you first mentioned. This is by far the best solution. As you say, putting vent bricks through the party wall is fraught with potential problems. If you no longer have to match ridges, then a warm roof also becomes an option, as does a breathable membrane with counterbattens over. Going back to your previous post, breathable membranes are just as moisture resistant as traditional felts; the only concerns are about whether they remove as much vapour from the roof void as traditional ventilation, and their long-term vapour permeability (will the pores still allow vapour through after 30-odd years of dust has collected?). -- Do you always need counterbattens over the permeable membrane ? I gather that depends on the air tightness of the tiles. Do interlocking concrete tiles need the gap ? Thanks, Simon. |
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#14
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tile vent for low pitch roof
On 21 May, 09:46, wrote:
On 21 May, 09:14, Hugo Nebula abuse@localhost wrote: On Wed, 20 May 2009 01:52:26 -0700 (PDT), a certain chimpanzee, randomly hit a keyboard and produced: I have now decided to increase the height of my ridge by about 225mm to get the maximum roof pitch / ceiling height I can. This means my ridge will no longer be shared with the neighbour - her roof will form an abutment onto 3 extra courses of brick above her existing monopitch ridge. Therefore, I will have a vertical area of wall that could contain airbricks to vent the roof. Only problem is that if someone in the future chose to extend her side, these could be blocked up. Is it worth the risk just to get some vents in ? I could then save money on permeable underlay. If you're now increasing the roof pitch, you could get the tile vents in that you first mentioned. This is by far the best solution. As you say, putting vent bricks through the party wall is fraught with potential problems. If you no longer have to match ridges, then a warm roof also becomes an option, as does a breathable membrane with counterbattens over. Going back to your previous post, breathable membranes are just as moisture resistant as traditional felts; the only concerns are about whether they remove as much vapour from the roof void as traditional ventilation, and their long-term vapour permeability (will the pores still allow vapour through after 30-odd years of dust has collected?). -- Do you always need counterbattens over the permeable membrane ? I gather that depends on the air tightness of the tiles. Do interlocking concrete tiles need the gap ? Thanks, Simon. I just read that counterbattens are not usually required if the membrane is draped rather than pulled taught. Since it will be draped (10mm), I may not need counterbattens. Simon. |
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#15
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tile vent for low pitch roof
On 21 May, 10:05, wrote:
On 21 May, 09:46, wrote: On 21 May, 09:14, Hugo Nebula abuse@localhost wrote: On Wed, 20 May 2009 01:52:26 -0700 (PDT), a certain chimpanzee, randomly hit a keyboard and produced: I have now decided to increase the height of my ridge by about 225mm to get the maximum roof pitch / ceiling height I can. This means my ridge will no longer be shared with the neighbour - her roof will form an abutment onto 3 extra courses of brick above her existing monopitch ridge. Therefore, I will have a vertical area of wall that could contain airbricks to vent the roof. Only problem is that if someone in the future chose to extend her side, these could be blocked up. Is it worth the risk just to get some vents in ? I could then save money on permeable underlay. If you're now increasing the roof pitch, you could get the tile vents in that you first mentioned. This is by far the best solution. As you say, putting vent bricks through the party wall is fraught with potential problems. If you no longer have to match ridges, then a warm roof also becomes an option, as does a breathable membrane with counterbattens over. Going back to your previous post, breathable membranes are just as moisture resistant as traditional felts; the only concerns are about whether they remove as much vapour from the roof void as traditional ventilation, and their long-term vapour permeability (will the pores still allow vapour through after 30-odd years of dust has collected?). -- Do you always need counterbattens over the permeable membrane ? I gather that depends on the air tightness of the tiles. Do interlocking concrete tiles need the gap ? Thanks, Simon. I just read that counterbattens are not usually required if the membrane is draped rather than pulled taught. Since it will be draped (10mm), I may not need counterbattens. Simon. All this reading. Apparently you have to ventilate under the membrane (cold roof) or over the membrane (warm roof) anyway, so you would still need vents in the eave and ridge for a monopitch roof. I looked in part C and it had little information on roofs. If I vented in the gable, I would need 4 standard plastic air bricks, and I have a boiler terminal nearby, so this is getting a bit tricky. I could solve it with a parapet wall and abutment, but I really don't want that appearance. Simon. |
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#16
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tile vent for low pitch roof
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#17
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tile vent for low pitch roof
On 21 May, 10:33, Hugo Nebula abuse@localhost wrote:
On Thu, 21 May 2009 01:46:44 -0700 (PDT), a certain chimpanzee, randomly hit a keyboard and produced: Do you always need counterbattens over the permeable membrane ? I gather that depends on the air tightness of the tiles. Do interlocking concrete tiles need the gap ? Just throwing an extra suggestion into the mix. Q1 - Not always, but if headroom inside is important, it allows you to fully fill the depth of the joists with insulation rather than leaving a void over and having to insulate under the rafters. The roof is a vaulted roof with a small roof void near the apex. The design requires several 225mm purlins due to the low pitch, and the gap between these purlins will be fully filled with glass fibre insulation. The BCO also wanted 20mm celotex under the entire roof structure to reduce cold bridging. The rafters above the purlins are left empty to allow ventilation. The roof was to be vented at the eaves and by tile ventilators. It is only since I found the tile vents are only spec'd for 20 degrees or more, else they may let in water, that I have had to rethink. Q2 - The BS does say that concrete interlocking tiles should be vented above the membrane, but it's something that rarely gets pulled up on site. -- But its a bit of a risk if you've done the roof without and you do get pulled. I guess then, put in the counterbattens (are they just 25 x 38 roofing battens ?), and why not eaves vents, but not bother at the ridge. But then, the eave vents might just get the BCO thinking along those lines. Simon. |
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#18
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tile vent for low pitch roof
On 21 May, 11:04, wrote:
On 21 May, 10:33, Hugo Nebula abuse@localhost wrote: On Thu, 21 May 2009 01:46:44 -0700 (PDT), a certain chimpanzee, randomly hit a keyboard and produced: Do you always need counterbattens over the permeable membrane ? I gather that depends on the air tightness of the tiles. Do interlocking concrete tiles need the gap ? Just throwing an extra suggestion into the mix. Q1 - Not always, but if headroom inside is important, it allows you to fully fill the depth of the joists with insulation rather than leaving a void over and having to insulate under the rafters. The roof is a vaulted roof with a small roof void near the apex. The design requires several 225mm purlins due to the low pitch, and the gap between these purlins will be fully filled with glass fibre insulation. The BCO also wanted 20mm celotex under the entire roof structure to reduce cold bridging. The rafters above the purlins are left empty to allow ventilation. The roof was to be vented at the eaves and by tile ventilators. It is only since I found the tile vents are only spec'd for 20 degrees or more, else they may let in water, that I have had to rethink. Q2 - The BS does say that concrete interlocking tiles should be vented above the membrane, but it's something that rarely gets pulled up on site. -- But its a bit of a risk if you've done the roof without and you do get pulled. I guess then, put in the counterbattens (are they just 25 x 38 roofing battens ?), and why not eaves vents, but not bother at the ridge. But then, the eave vents might just get the BCO thinking along those lines. Simon. I'm looking into the forticrete mono pitch dry ridge system. Just waiting for them to tell me it cannot be used a low pitch ;- Simon. |
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#19
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tile vent for low pitch roof
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#20
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tile vent for low pitch roof
On 21 May, 12:18, Hugo Nebula abuse@localhost wrote:
On Thu, 21 May 2009 03:04:04 -0700 (PDT), a certain chimpanzee, randomly hit a keyboard and produced: The roof is a vaulted roof with a small roof void near the apex. The design requires several 225mm purlins due to the low pitch, and the gap between these purlins will be fully filled with glass fibre insulation. The BCO also wanted 20mm celotex under the entire roof structure to reduce cold bridging. The rafters above the purlins are left empty to allow ventilation. What gap between the purlins? By 'purlins', I assume you mean the timbers that run parallel with your wall plate and have rafters over them at right angles? If you are, and you say you need several, that suggests a roof spanning at least 6-8m from wall plate to ridge! If you're not, I've not a clue how you're roof is constructed. If you can afford to lower your ceiling by 225mm, then headroom was never an issue. So why couldn't you have lowered your wallplate to get you the pitch you needed? I'm confused. And also a little bit sad for becoming involved in all of this on a day off :-( -- Oh, sorry for that ;-) Go and have a beer ! Roof ridge to eaves about 5 metres, vaulted roof, on sideways across the back of the house. Basically, a low pitch roof (about 11 degrees) or anything less than 15 degrees should be designed like a flat roof, since most of the load is downward, also meaning that thicker rafters are needed. That was according to tables in the older part A. The design is 225mm purlins every 730mm, and the "rafters" are really counterbattens (50mm), so the primary structural component is the purlins. The direction of the purlins is the shorter dimension, and at this pitch with usual rafters, they would have to be about nearly 225mm also, and follow the roof pitch all the way down, thus cutting off more headroom at the lowest part, despite losing the 50mm. WIth the purlins, the lowest purlin is 730mm from the bottom of the roof, and beyond this the ceiling can be flattened out, thus increaseing head height at the lowest point. The pitch is constrained by the required head height, and originally the ridge of next door, but now I am building higher, by a window over the side abutment. Roof designed passed by Struct Eng. Think of metal framed buildings with metal roofs for the idea of serveral purlins and thinner members resting on them. It does make sense and does improve lower head height for constrainted pitch, whilst importantly also enabling most of the insulation to be lost in the thickness of the roof. I should have posted a diagram. Why am I putting the roof on "sideways" across the back of my house and not the usual way round ? Well partly to mirror the next door (which has a much smaller extension, this steeper pitch etc), but also to put a lovely high ceiling and arched window in the end wall of the kitchen where it will look cool ! Or maybe I should just put on a flat roof and felt. Now you can finish your jug of foaming ale ! Simon. |
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#21
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tile vent for low pitch roof
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#22
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tile vent for low pitch roof
On 24 May, 15:43, Hugo Nebula abuse@localhost wrote:
On Thu, 21 May 2009 05:40:40 -0700 (PDT), a certain chimpanzee, randomly hit a keyboard and produced: Roof ridge to eaves about 5 metres, vaulted roof, on sideways across the back of the house. Basically, a low pitch roof (about 11 degrees) or anything less than 15 degrees should be designed like a flat roof, since most of the load is downward, also meaning that thicker rafters are needed. That was according to tables in the older part A. The design is 225mm purlins every 730mm, and the "rafters" are really counterbattens (50mm), so the primary structural component is the purlins. The direction of the purlins is the shorter dimension, and at this pitch with usual rafters, they would have to be about nearly 225mm also, and follow the roof pitch all the way down, thus cutting off more headroom at the lowest part, despite losing the 50mm. WIth the purlins, the lowest purlin is 730mm from the bottom of the roof, and beyond this the ceiling can be flattened out, thus increaseing head height at the lowest point. Ah, now I understand. Here's a suggestion: lay 50mm Celotex between the 50mm 'rafters' to create a warm roof. I haven't done the calcs, but you probably won't need to insulate under the purlins. You would still need to counterbatten over but only with 25mm or 19mm battens. Also, strictly speaking, you still need to ventilate the void over the membrane, but speak to your BCO who may be prepared to overlook this. Even if not, you could use a vented monopitch ridge. -- Hi, thanks for the ideas. BCO is wanting me to use forticrete centurion tiles, since there is a spec for down to 10 degrees for a simple monopitch roof. I've just heard the centurion dry vented mono ridge is not spec'd below 12.5 degrees, and I'll not risk the venting issue with BCO. If I stick with the cold roof and have eaves vent and gable vents it should be OK. I was going to have a projecting verge on the gable, and I'll hide several vents into the gable under this. The boiler vent will be below 60cm lower, so no problems there I don't think. Thanks for your time, Simon. |
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