First off, apologies - long post - hopefully the pictures will make it a bit less painful to read and easier to help with answering my questions!
I'd like to do a partial conversion on my attic - (ie: tongue & groove floorboards from Homebase and plasterboard) but I'm not sure the truss roof will support the extra weight.
I already floored the very centre area a few years back for easier storage but would like to be able to use the sides only for storage and the main space for maybe me, my acoustic guitar and my laptop, and do some recording (just for myself - wouldn't need studio quality/finish/sound proofing really). I didn't plan on putting insulation in behind the plasterboard (I read the roof needs to be left clear for ventilation and if the temp is too hot or cold, I just won't go up. It's usually tolerable though).
It would just be nice if I continued the floor out further and put up plasterboard sheets to cut down on dust and make it much brighter, more confortable and more useable. There will probably never be anyone up there other than me (at most, a couple of days a week for an hour or three) and I don't plan on storing heavy boxes or stomping around..
Below are some pics to give half an idea of what I'd like to do anyway.
It's about 16 foot between the two gable walls and the highest point of the truss is just over 9 foot.
The roof is a Double 'W' Truss. I would like to continue out the floor and put up plasterboard in the areas roughly marked in the following pics:
(Actually, looking again now, I would probably put verticle laths from half way up the lower part down to the floor and plasterboard that, if it makes any difference)
(The pics were taken on my phone and the camera lens doesn't go very wide so I pieced the above together from 3 pics, obviously! The red line roughly indicates where I'd be putting up plasterboard)
My main concerns/questions are:
1. Will the truss roof support the weight of more floorboards and plasterboard sheets??
You're probably aware given the type of roof but to be clear, the attic 'floor' beams are held together in a good few places with the same joining plates as the rest of the truss beams:
2. No doubt these plates won't take too much weight but how much??
3. Will the gap up the backs of the plasterboard and over the top be enough ventilation?
Another thing I'm unsure/weary about are the lengths of wood I've marked as "braces?" :-) in the pics below.
These lengths of wood don't look very strong, were flung up (crooked, diagonally, not in line etc) with some nails and weren't cut properly. It looks like most of them were snapped over someone's leg!
I'm guessing these were nailed on (maybe temporarily?) just to keep the truss triangles/W's square and 400mm apart.
4. Can the 'braces' on the floor be safely taken away so I can put the floorboards down or would other support need to be put in place before removing them?
Needless to say, I'm a tad concerned that the roof is going to fall down with the weight of the floorboards and plasterboard. Are there any other concerns with doing this work?
Any pro or educated opinions/suggestions/help is much appreciated