Over the winter the flat roof on our extension (40 sqm approx) has developed a leak. it appears that it has been patched on numerous occasions with a number of different materials including GRP.....the original layer appears to be felt or some derivative.
I have come to the conclusion that further patching is unlikely to be worth the time and hassle and I'm looking to fit a new EPDM membrane.
At the moment there appears to be no insulation at all with the current waterproofing fixed directly to the wooden roof deck and just an air gap between deck and the plasterboard ceiling.
Due to the unpredicatable nature of the weather (We live in western Scotland) I would much prefer to add an additional layer to the existing roof rather than strip everything back to the deck.
Clearly the simplest method is to bond the EPDM directly to the existing roof but I know that "Cold Roofs" are now not permitted in Scotland...In addition, additional insulation would seem a sensible idea.
What I am proposing is to utilise the existing covering as the "vapour control layer" and add a layer of 'kingspan type' insulation topped with a Ply / OSB deck to give a nice new surface to bond the rubber to.
EDIT - I have a 500mm parapet around the roof so there is plenty of depth available to play with.
Will this work? Are there any Gotchas? If it is not possible, then am I allowed to merely repair the current roof using an EPDM sheet or will that put me foul of building regs?
Thanks in advance for your help
Gareth
I have come to the conclusion that further patching is unlikely to be worth the time and hassle and I'm looking to fit a new EPDM membrane.
At the moment there appears to be no insulation at all with the current waterproofing fixed directly to the wooden roof deck and just an air gap between deck and the plasterboard ceiling.
Due to the unpredicatable nature of the weather (We live in western Scotland) I would much prefer to add an additional layer to the existing roof rather than strip everything back to the deck.
Clearly the simplest method is to bond the EPDM directly to the existing roof but I know that "Cold Roofs" are now not permitted in Scotland...In addition, additional insulation would seem a sensible idea.
What I am proposing is to utilise the existing covering as the "vapour control layer" and add a layer of 'kingspan type' insulation topped with a Ply / OSB deck to give a nice new surface to bond the rubber to.
EDIT - I have a 500mm parapet around the roof so there is plenty of depth available to play with.
Will this work? Are there any Gotchas? If it is not possible, then am I allowed to merely repair the current roof using an EPDM sheet or will that put me foul of building regs?
Thanks in advance for your help
Gareth