bigegg
Scream Not Working Because Space Make Deaf
- Messages
- 9,471
- Location
- Leeds, West Yorkshire
I have some leaks in my garage workshop roof.
the roof is 20ft X 10ft, sloped 1" per foot (1:12) along the long edge
it's supported by 11off 10ft beams at 2ft spacing.
there is a 6ft window in one wall which *is supposed* to support 3 of the beams.
on top of the beams are two (staggered jointed) layers of ply: an 18mm layer, and a 12mm layer with a coat of bitumen paint between the layers, and another layer of bitumen on top.
over this is profiled fibreglass roofing sheets - which were second hand, and not necessarily in perfect condition.
the ply sheets are marine ply, and with the bitumen coating are in good shape: the existing beams, not so much.
the roof has dropped above the window, and also the beams have bowed slightly.
this is enough that water is running back along the roof sheets and making its way through the gaps in the ply to drip, a*lot* in three places.
ideally, I know I need to completely replace the roof: beams, ply and roof sheets, but even doing the labour myself it's a 1k+ job by the time I've hired a skip.
I'd also be working alone, so it's going to be a 4-5 day job where everything in the garage is exposed to the elements.
I have reinforced the area around the window, and jacked up the roof beams so they are roughly in line.
I'm going to remove the corrugated profile fibreglass sheets.
I've been toying with the idea of making three triangular torsion box beams 20ft long from some 12mm ply, and roofing battens to add a bigger slope to the roof. an additional 13in at front, sloping to 3in at rear.
these will rest on the existing plywood roof, shimmed to remove the "bow".
11 cross beams in a T - shape made from a piece of 6x1 and a 3x1.5.
then re-fit the fibreglass - replacing pieces as necessary.
with the stuff I already have on hand, i should be able to get that done for around £400 and three days work: 1 to build the beams, and remove the old sheets.
then two days to refit.
or...
I can buy a sheet of epdm for £200 and put it straight over the ply after I've removed the fibreglass.
but...
the bitumen paint is 5 or 6 years old. is it likely to affect the rubber?
the epdm is usually glued down. will the adhesive stick to the bitumen?
are my options: another layer of (3mm? ) ply on top as a protective layer for the rubber?
something like carpet underlay as a protective layer?
nail the rubber down? (it's an installation method according to "rubber roofs.co.uk") as I would a felt roof?
other ideas/suggestions/comments welcome.
thanks
the roof is 20ft X 10ft, sloped 1" per foot (1:12) along the long edge
it's supported by 11off 10ft beams at 2ft spacing.
there is a 6ft window in one wall which *is supposed* to support 3 of the beams.
on top of the beams are two (staggered jointed) layers of ply: an 18mm layer, and a 12mm layer with a coat of bitumen paint between the layers, and another layer of bitumen on top.
over this is profiled fibreglass roofing sheets - which were second hand, and not necessarily in perfect condition.
the ply sheets are marine ply, and with the bitumen coating are in good shape: the existing beams, not so much.
the roof has dropped above the window, and also the beams have bowed slightly.
this is enough that water is running back along the roof sheets and making its way through the gaps in the ply to drip, a*lot* in three places.
ideally, I know I need to completely replace the roof: beams, ply and roof sheets, but even doing the labour myself it's a 1k+ job by the time I've hired a skip.
I'd also be working alone, so it's going to be a 4-5 day job where everything in the garage is exposed to the elements.
I have reinforced the area around the window, and jacked up the roof beams so they are roughly in line.
I'm going to remove the corrugated profile fibreglass sheets.
I've been toying with the idea of making three triangular torsion box beams 20ft long from some 12mm ply, and roofing battens to add a bigger slope to the roof. an additional 13in at front, sloping to 3in at rear.
these will rest on the existing plywood roof, shimmed to remove the "bow".
11 cross beams in a T - shape made from a piece of 6x1 and a 3x1.5.
then re-fit the fibreglass - replacing pieces as necessary.
with the stuff I already have on hand, i should be able to get that done for around £400 and three days work: 1 to build the beams, and remove the old sheets.
then two days to refit.
or...
I can buy a sheet of epdm for £200 and put it straight over the ply after I've removed the fibreglass.
but...
the bitumen paint is 5 or 6 years old. is it likely to affect the rubber?
the epdm is usually glued down. will the adhesive stick to the bitumen?
are my options: another layer of (3mm? ) ply on top as a protective layer for the rubber?
something like carpet underlay as a protective layer?
nail the rubber down? (it's an installation method according to "rubber roofs.co.uk") as I would a felt roof?
other ideas/suggestions/comments welcome.
thanks