Surrey Carpentry

Professional Carpentry & Joinery Service

December 1st, 2009 by admin
Dual Pitched Gable Valley Roof - Godalming

Dual Pitched Gable Valley Roof - Godalming

< The end product

We had to get over a few minor architect glitches on this roof.

Viewed from the top, the shape of the new extention onto which we built the roof was an ‘L’ shape, hence the valley rafter, and gable ended at both ends.

It was a dual pitch roof, meaning that the side of the roof you can’t see in the photo to the left was 45 degrees and a lot shorter and steeper than the side you can see, which was  at 17 degrees pitch, longer and shallower.

The original plan, i believe, was for the shallow side of the roof to be 22 degrees, but if we had gone ahead with that, the part of the roof which attached to the house would have been half way up the glass in the windows upstairs, which would’ve made taking this photo rather difficult!

The process

Steel ridge beam with timber bolted to it

Steel ridge beam with timber bolted to it

First common rafter goes in

First common rafter goes in

Once the builders had raised the brickwork and fixed the timber wall plate on, the first thing we needed to do was to position the steel ridge beam, which had been clad in timber so that all the rafters could be fixed to it.

You can see in the photo to the right how the pitches and lengths (run(s)) of the roof are very different.

Once the first rafter had been cut and tried in, I used it as a template to cut the rest, and then repeated the process for the 45 degree side of the roof.

Valley rafter

Valley rafter

Common rafters with spaces for velux's

Common rafters with spaces for velux's

I cut the valley rafter in, shown left, before fixing the common rafters. Its easier to get them in first and work up to them with the common rafters, shown right.The shallow side of the roof had three velux’s in the far section with another two in the steep side, and two in the section attached to the existing house.

Openings for velux's and view of dual pitches

Openings for velux's and view of dual pitches

45 degree pitch with velux's, sprockets and facia

45 degree pitch with velux's, sprockets and facia

Roofers felting, batoning & tiling the roof

Roofers felting, batoning & tiling the roof

Once the common rafters were in, the trimmers were fitted to form the openings for the velux’s, and the common rafters were noggined for stability above the wallplates.

The jack rafters were then fixed to the ridge beam and vally rafter, before cutting some sprockets to be fitted to the ends of the short steep rafters to support the lowest coarse of tiles.

Once the sprockets were on, the soffits and facias were fitted, ready for the roofers to come and make it watertight, a very celebrated event in the english weather let me tell you!

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