garage roof replacement

[ih]

hi
My single garage 5mx3m has asbestos roof sheets and am thinking of replacing it with flat roof i will appreciate any help/advise and also help with the following.
1. what size ply will i need and how many (advise thickness also)2. What size joists and how many and also thickness.
3.What quality felt, size and quantity
thanking in advance

 

[catlad]

16=6x2 evenly spaced joists, 10=osb3 boards 3=rolls torch on underlay, same for top sheet, 4 lengths tilt fillet. A bag of baton nails and maybe some wall straps for the joists, that should get you started.

 

[devonlad]

bit ott with the boards. 5 will do a garage roof normally. 1x 20m 3b sand finish for a nailed base layer £40 2x 16m torch on underlay (although if you can scrounge a metre or 2 you can get away with 1 roll as a normal garage roof quite annoyingly requires a little over 1 roll to cover) and then 3 rolls of capsheet mineral.

is there any reason you want a flat roof?

in recent years i have been replacing asbestos garage roofs with box profile steel sheet, either insulated or just fleece backed.

a lot cheaper and easier. loads of different colours too.
can screw straight onto old asbestos sheet joists

 

[catlad]

Devonlad you are not still in the dark ages are you, with them big 8x4 sheets OSB3 are t&g 8x2. The box profile sheets is the way I would go if it was my garage roof.

 

[devonlad]

done my triple garage store with box profile 2 years ago with a few opaque sheets. best move ever.

cant be arsed with the extra expense of t&g unless spec'd and even then will use 8x4 t&g

 

[catlad]

Well it must be me in the dark ages then, as I did not know t&g was available in 8x4 sheets.

 

[devonlad]

not seen it widely available but norboard do it and a few others. wickes even sell it if you dont mind paying £25 a sheet

 

[catlad]

8x4 sheets are a waste of time for me as I can't carry them up the ladder safely, so I just buy the 8x2 sheets now, and for people doing there own roofs thats what I would recommend.

 

[ih]

Hi Guys thanks for the valuable information kindly correct me with the following.
1.1x20m cost £40
2.2x16m underlay cost£35= £70
3. 3 rolls capsheet kindly advise if this will be 1mX8m and the cost £30=£90
if possible advise what quality capsheet
thanking you in advance.

 

[cotswoldbuilders]

EPDM will work out cheaper than felt, easier for you to do.
Osb t&g 600x2.4m £7 each