What is the most long-lasting corrugated materal for roofs?

The roof has a slight pitch (probably about 5 degrees). It is an
extension on the back of a very old stone house. I'd also like to know
the best sort of flashing to use, where the roof abuts the stone wall
of the house. It needs to be something as well-sealed as possible to
stop rainwater getting blown under it by the wind.

Thanks for any help.

JD

JimD wrote:
What is the most long-lasting corrugated materal for roofs?

The roof has a slight pitch (probably about 5 degrees). It is an
extension on the back of a very old stone house. I'd also like to know
the best sort of flashing to use, where the roof abuts the stone wall
of the house. It needs to be something as well-sealed as possible to
stop rainwater getting blown under it by the wind.

One of the modern fibre-cement sheets (e.g.
http://www.marleyeternit.co.uk/products/Products/TechnicalData.aspx?pcat=2&pcatname=Profiled+Sheeti ng&rangeid=9&rangename=Profile+3&pid=14&prodname=P rofile%203

is long-lasting, but 5 degrees is too shallow for it.

I'd go for a steel profile. It's available either relatively cheaply
and easily, in various profiles and either polyester or (longer-lasting)
plasticote finishes, or, rather more expensively, as an insulated
sandwich. All the accessories you might need, such as fixing screws,
verge cappings, wall flashings, and profiles fillers, are available. At
5 degrees, you should also seal sheet side overlaps as per the makers'
instructions.

As ever, the devil's in the detailing. Flashing anything to a stone
wall could be tricky, depending on how flat the wall is. You'll almost
certainly need to consider building regs, too.

http://www.slecladding.co.uk/ is an informative site.

In message , Kevin Poole
writes


JimD wrote:
What is the most long-lasting corrugated materal for roofs?
The roof has a slight pitch (probably about 5 degrees). It is an
extension on the back of a very old stone house. I'd also like to know
the best sort of flashing to use, where the roof abuts the stone wall
of the house. It needs to be something as well-sealed as possible to
stop rainwater getting blown under it by the wind.

One of the modern fibre-cement sheets (e.g.
http://www.marleyeternit.co.uk/produ...lData.aspx?pca
t=2&pcatname=Profiled+Sheeting&rangeid=9&rangenam e=Profile+3&pid=14&prod
name=Profile%203

is long-lasting, but 5 degrees is too shallow for it.

I'd go for a steel profile. It's available either relatively cheaply
and easily, in various profiles and either polyester or
(longer-lasting) plasticote finishes, or, rather more expensively, as
an insulated sandwich. All the accessories you might need, such as
fixing screws, verge cappings, wall flashings, and profiles fillers,
are available. At 5 degrees, you should also seal sheet side overlaps
as per the makers' instructions.

You might also need to create a *drip* to encourage rain water to drop
into the gutter rather than clinging to the underside of the roofing
sheet.

As ever, the devil's in the detailing. Flashing anything to a stone
wall could be tricky, depending on how flat the wall is. You'll almost
certainly need to consider building regs, too.

I have sealed agricultural corrugated steel roofs with a 200 x200mm
folded angle and then filled the gaps with expanding foam. Not at 5deg.
and not involving BRs. however.

regards

--
Tim Lamb

On Sat, 5 Apr 2008 10:03:07 +0100, Tim Lamb
wrote:

In message , Kevin Poole
writes


JimD wrote:
What is the most long-lasting corrugated materal for roofs?
The roof has a slight pitch (probably about 5 degrees). It is an
extension on the back of a very old stone house. I'd also like to know
the best sort of flashing to use, where the roof abuts the stone wall
of the house. It needs to be something as well-sealed as possible to
stop rainwater getting blown under it by the wind.

One of the modern fibre-cement sheets (e.g.
http://www.marleyeternit.co.uk/produ...lData.aspx?pca
t=2&pcatname=Profiled+Sheeting&rangeid=9&rangena me=Profile+3&pid=14&prod
name=Profile%203

is long-lasting, but 5 degrees is too shallow for it.

I'd go for a steel profile. It's available either relatively cheaply
and easily, in various profiles and either polyester or
(longer-lasting) plasticote finishes, or, rather more expensively, as
an insulated sandwich. All the accessories you might need, such as
fixing screws, verge cappings, wall flashings, and profiles fillers,
are available. At 5 degrees, you should also seal sheet side overlaps
as per the makers' instructions.

You might also need to create a *drip* to encourage rain water to drop
into the gutter rather than clinging to the underside of the roofing
sheet.

As ever, the devil's in the detailing. Flashing anything to a stone
wall could be tricky, depending on how flat the wall is. You'll almost
certainly need to consider building regs, too.

I have sealed agricultural corrugated steel roofs with a 200 x200mm
folded angle and then filled the gaps with expanding foam. Not at 5deg.
and not involving BRs. however.

regards

Thanks, Tim (and Kevin). It would be feasable to increase the pitch of
the roof - with some extra work. From what Kevin said, it sounds like
it might be worth doing.

JD