Help with garage roof options

[acg83]

Hi,

We're planning major renovations to the house so need the garage to store house stuff. Currently the garage roof is corrugated roofing which drips in places causing the general condition of the garage to be a little damp.

The question I have is whether replacing like-for-like will definitely improve the conditions inside or whether laying a new roof - possibly OSB and EPDM membrane and insulating is a worthwhile investment.

The section of the pitched roof with the rafters is shown in the image:

Screen Shot 2017-02-18 At 22.23.18

• acg83
• 18 Feb 2017

Garage rafter plan

The two rafters running left to right are 200x47 and the top-bottoms are 100x47. As you can see they're at pretty unhelpful pitches for 2440x1220 boards to work nicely.

So, would it be best jut to replace the old corrugated roof materials, or, if I add some more rafters, would it give me a much more weather-proof finish using an EPDM system?

Any thoughts appreciated!

Adam

 

[noseall]

If I intended to store stuff of any value, or stuff that was sensitive to damp, then it's a no brainer - new roof is a must. And one that is unlikely to drip condensation. I'd be thinking about insulation, ply deck and decent section rafters and probably a ceiling too.

 

[acg83]

If I intended to store stuff of any value, or stuff that was sensitive to damp, then it's a no brainer - new roof is a must. And one that is unlikely to drip condensation. I'd be thinking about insulation, ply deck and decent section rafters and probably a ceiling too.

Hi, thanks for the reply. Pretty much confirmed the route I'm heading down to be honest.

Any difference between OSB and ply for this application? Only because ply seems more expensive. Would 18mm be required or would a thinner board be OK for roofing applications?

Cheers

Adam

 

[catlad]

OSB 3 t&g is a standard roofing board.

 

[acg83]

Thanks guys.

Another question, if I may.

Does anyone know where to get adjustable slope or ridge rafter hangers that will accept 200x75mm timbers?

I should say, that I've found a strong tie SPR75 product, but nowhere who sells them.

Thanks!