So, I’m back with a brief progress report and a question regarding fascias, trims and soffits. So as you can see, the frame is now mainly up and the roof has been decked. The rafters are 150mm high and the front overhang extends 600mm out. Today we cut a recessed ‘channel' through the roof deck at the front (about 40mm back from the edge) which will be re-lined with more OSB3 and then covered in GRP with the rest of the roof deck. This will form a concealed box gutter which will fall towards a hopper out to the left-hand side:
We will use GRP Drip trim on the front, Raised Edge Trims on either side, and Wall Fillet at the back. We were going to do the fascia in OSB3 and then clad in T&G Larchwood cladding like the rest of the building, however for speed and neatness I’m just looking into Aluminium or uPVC fascias and soffits. I have no experience of these so had some quick questions:
Firstly, are these uPVC fascia boards simply pinned directly to the rafter ends, or should we still do OSB over the front rafters and then glue/pin the uPVC fascia board onto that? The width of the roof is 6m, so I would need a 5m board and then an extra meter with an in-line joiner. If I put this directly onto the ends of the rafters does it have adequate strength to hold its form over 5m? Also, am I right in thinking 175mm would be the correct fascia height to accommodate the rafter and the soffit underneath?
Likewise for the soffits. I was going to do this in OSB with larch wood cladding, however I’m thinking of prefab uPVC soffit board. Since the overhang is 600mm you don’t normally see soffit boards in this width, but I presume two 30mm T&G boards would be what I’m after? Also, since I need to secure 4 LED down lights in the overhang and I OK to do that or will the strength of these boards be much less than the OSB option?