Heyho,
(my first post so be gentle!)
I'm renovating a brick shed's flat roof as part of a conversion to a garden office/workshop/den. The shed has a slightly sloping roof of 3x3 Metres with a pitch (if you can call it that!) of about 3 degrees (one wall is 2 courses higher than the opposite. I'm using TR31 boards (see link at end) over the joists, which are attached directly on top of a wall plate and overhang by 200mm either end. These are insulation with a vapour barrier and a plywood top. My original plan was a rubber membrane directly over the TR31 boards. However, on reflection it's a rural area with a mixture of farm and residential. The majority of buildings other than houses have corrugated steel roofing, and so I am considering this instead.
I'd be grateful for some advice on:
How should I attach the corrugated steel sheeting to the top of the TR31 boards? I'm concerned about possible wind uplift. Should I attach straight through the TR31 boards and directly into the joists below?
What type of membrane/felt (if any?) should I use above the TR31 boards
and below the corrugated sheeting? They're not supposed to get wet at all. Would a standard roof tile underlay tiles work here? It would be completely hidden from view.
http://www.insulation.kingspan.com/ireland/tr31.htm
Cheers
Ferg
(my first post so be gentle!)
I'm renovating a brick shed's flat roof as part of a conversion to a garden office/workshop/den. The shed has a slightly sloping roof of 3x3 Metres with a pitch (if you can call it that!) of about 3 degrees (one wall is 2 courses higher than the opposite. I'm using TR31 boards (see link at end) over the joists, which are attached directly on top of a wall plate and overhang by 200mm either end. These are insulation with a vapour barrier and a plywood top. My original plan was a rubber membrane directly over the TR31 boards. However, on reflection it's a rural area with a mixture of farm and residential. The majority of buildings other than houses have corrugated steel roofing, and so I am considering this instead.
I'd be grateful for some advice on:
How should I attach the corrugated steel sheeting to the top of the TR31 boards? I'm concerned about possible wind uplift. Should I attach straight through the TR31 boards and directly into the joists below?
What type of membrane/felt (if any?) should I use above the TR31 boards
and below the corrugated sheeting? They're not supposed to get wet at all. Would a standard roof tile underlay tiles work here? It would be completely hidden from view.
http://www.insulation.kingspan.com/ireland/tr31.htm
Cheers
Ferg
