Howling gale in my loft!
There is a powerful draft up in my loft. I am well aware that a loft should
be ventilated, but if the wind whistles right through it's going to suck a lot of heat out of the house in Winter. I've just added 170mm of rockrool to the loft, but I'm wondering if it would make sense to cut down on the breeze that's getting in. It's an old stone-built house (1850s) I can see light getting in through some holes in the soffit at one place, and part of the roof has no felt inside, so the wind gets in between the roof tiles there. In the interest of thermal efficiency, should I block some of the sources of the drafts? Thanks Al |
Howling gale in my loft!
AL_n wrote:
There is a powerful draft up in my loft. I am well aware that a loft should be ventilated, but if the wind whistles right through it's going to suck a lot of heat out of the house in Winter. I've just added 170mm of rockrool to the loft, but I'm wondering if it would make sense to cut down on the breeze that's getting in. It's an old stone-built house (1850s) I can see light getting in through some holes in the soffit at one place, and part of the roof has no felt inside, so the wind gets in between the roof tiles there. In the interest of thermal efficiency, should I block some of the sources of the drafts? Better is to cover the insulation with something windproof. Boarding, or simply plastic sheet maybe. Fixing holes in eaves that were always built that way is a thankless task IMHO. Thanks Al |
Howling gale in my loft!
The Natural Philosopher wrote in news:i6rbum$bqe$2
@news.albasani.net: Better is to cover the insulation with something windproof. Boarding, or simply plastic sheet maybe. Fixing holes in eaves that were always built that way is a thankless task IMHO. Thanks for the suggestions. I was wondering how wind-proof rockwool is... One thing I was thinking of covering the existing rockwool with the so- called "space-blanket" rolls seen at B&Q - a layer of rockrool covered on each sode by reflective plastic material. Al |
Howling gale in my loft!
AL_n wrote:
The Natural Philosopher wrote in news:i6rbum$bqe$2 @news.albasani.net: Better is to cover the insulation with something windproof. Boarding, or simply plastic sheet maybe. Fixing holes in eaves that were always built that way is a thankless task IMHO. Thanks for the suggestions. I was wondering how wind-proof rockwool is... One thing I was thinking of covering the existing rockwool with the so- called "space-blanket" rolls seen at B&Q - a layer of rockrool covered on each sode by reflective plastic material. Rockwool definitely loses efficacy in a howling gale, so do whatever it takes. Al |
Howling gale in my loft!
On Sep 15, 9:56*pm, The Natural Philosopher
wrote: Better is to cover the insulation with something windproof. Agreed, and to increase it to at least 300mm. Cheers Richard |
Howling gale in my loft!
geraldthehamster wrote:
On Sep 15, 9:56 pm, The Natural wrote: Better is to cover the insulation with something windproof. Agreed, and to increase it to at least 300mm. Cheers Richard Something breathable would be better than ordinary plastic sheet to reduce the risk of condensation forming and eventually rotting the ceiling rafters. Bob |
Howling gale in my loft!
On 16 Sep, 13:57, Bob Minchin
wrote: geraldthehamster wrote: On Sep 15, 9:56 pm, The Natural wrote: Better is to cover the insulation with something windproof. Agreed, and to increase it to at least 300mm. Cheers Richard Something breathable would be better than ordinary plastic sheet to reduce the risk of condensation forming and eventually rotting the ceiling rafters. Bob That's probably true. Having said that, in an ideal world one would have a vapour barrier underneath the insulation, to stop warm moist air rising into the loft space from the house. Cheers Richard |
Howling gale in my loft!
On Sep 16, 3:31*pm, geraldthehamster wrote:
That's probably true. Having said that, in an ideal world one would have a vapour barrier underneath the insulation, to stop warm moist air rising into the loft space from the house. Often wondered, would Dulux Plaster Seal (interior) do sufficiently - either on top of the ceiling or underneath where it is bare? There are various other sealing products available, which can then be painted. |
Howling gale in my loft!
geraldthehamster wrote:
On 16 Sep, 13:57, Bob wrote: geraldthehamster wrote: On Sep 15, 9:56 pm, The Natural wrote: Better is to cover the insulation with something windproof. Agreed, and to increase it to at least 300mm. Cheers Richard Something breathable would be better than ordinary plastic sheet to reduce the risk of condensation forming and eventually rotting the ceiling rafters. Bob That's probably true. Having said that, in an ideal world one would have a vapour barrier underneath the insulation, to stop warm moist air rising into the loft space from the house. Cheers Richard yes that would be ideal but how many installers of extra insulation think to add such a vapour barrier?? Bob |
Howling gale in my loft!
On 16 Sep, 19:55, Bob Minchin
wrote: geraldthehamster wrote: On 16 Sep, 13:57, Bob wrote: geraldthehamster wrote: On Sep 15, 9:56 pm, The Natural wrote: Better is to cover the insulation with something windproof. Agreed, and to increase it to at least 300mm. Cheers Richard Something breathable would be better than ordinary plastic sheet to reduce the risk of condensation forming and eventually rotting the ceiling rafters. Bob That's probably true. Having said that, in an ideal world one would have a vapour barrier underneath the insulation, to stop warm moist air rising into the loft space from the house. Cheers Richard yes that would be ideal but how many installers of extra insulation think to add such a vapour barrier?? Bob- Hide quoted text - - Show quoted text - I should think approximately none, especially as it would involve lifting old, filthy insulation. More of a practical proposition if you are insulating for the first time, of course. If you don't have it, then I think the earlier observation, about making sure anything overlaid to prevent blowing around should be pervious to moisture, is right. Though if you've used rolls of insulation, just laying a few wooden battens around should hold it down all right. Then again I've never been in the OP's loft. Cheers Richard Cheers Richard |
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