Garage screw up

jackracing · 29 Apr 2012

I have built a 3 x 5 metre garage.

I my 'wisdom' I fitted a corugated upvc roof.
Dumb move, I forgot the level of wind here (half mile from a wind farm).
Needless to say it is now a bit of a mess.

Originaly fitted onto 45 x 75mm supports, 600mm centres, with what I thought was a suitable fall.

I am now looking at replacing it with a ply/OSB felt covered roof.

Some advice please.
Will the original 45x 75 supports be ok?
OSB or ply?
What sort of felting to use.

Hope someone can help with this please

noseall · 29 Apr 2012

45mm x 75mm at 600mm centres.

They are so inadequate that they don't even register in any span tables!!

To span 3m on a flat roof you would need a minimum of 150mm x 50mm at say 400mm centres.

18mm osb will be adequate for a covered flattie.

Get a pro' in to do the membrane.

Norcon · 29 Apr 2012

Why don't you use galvinised corrugated tin laid over a membrane?
Could be round profile or box with a colour coating of your own selection.
I've got the box profile (25mm) on a small shed about your size with a slate blue colour.

Laid over the top of a failed felt/plywood roof.

Then had a combined facia/soffit folded and lipped to my spec from flat stock of the same material and colour, all supplied by the same company.

maltaron · 30 Apr 2012

Norcon, The roof you suggest is a great idea, it looks good and performs well. However, it does sweat terribly. I put insulation between the joists and lined the inside with 12mm ply. This made for a warm, dry building.
The other advantage of this type of roof is that it can be supplied in very long lengths to avoid cross joints, I had 7m long sheets on one garage,(b*****s to handle tho')

Norcon · 30 Apr 2012

I've another garage with 8m long sheets on. I put builders felt below.
(the clear stuff reinforced with glass fibre ribbing) Not sure of the name.
But it puts an end to any drips. Though it would rarely drip anyway as the temp on both sides is always similar.
Belts and braces..

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Garage screw up

jackracing

noseall

Norcon

maltaron

Norcon

DIYnot Local

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