Partial Garage Conversion.....70/30

[RS2000]

Here goes.....

I am embarking on a partial garage conversion (Approx 70/30) allowing the garage door to still open and will be used for storage. I have read some of the other posts and have gleaned some useful information from them. Thanks to whoever concerned

I will use this post as to record our project with pictures and information and problems solved. I am pretty wet behind the ears when it comes to a big project like this so if you guys could help me through it I would be eternally grateful.

Paul

 

[RS2000]

The damp corse in the garage is approx 100mm from the floor although outside it is actually approx 170mm. I am looking to raise the floor up to the level of the internal floor as shown in first picture. As you will see the damp course is actually higher than the internal floor of the utility room, this seems odd to me, is this a problem? Do I have to seal the floor, as it is just concrete.

One of the walls is external and is only a brick thick, I was hoping to put up a wood frame work and plasterboard it but have read that it must be sealed somehow, also you will notice that there are posts in two places along the wall will the have to be sealed in the wall or are they thick enough for the plasterboard to be butted up against and leave them in the room.

Any help welcome

 

[noseall]

to up grade to full spec i don't think timber framing is an option. the difficulty is fixing a membrane to the inside of the studs. basically on a timber frame build you would have (inside to out) plasterboard, vapour barrier, timber studs, breathable membrane, cavity with insulation, 105mm brickwork.
also you will need to build a full spec dividing wall between garage and habitable, with a min u value of 0.35. this will probably need foundations, unless you're on a reinforced raft, with cavity wall or similar spec.
the internal pillars will have to be knocked off, so it may be wise to build an internal masonry skin to this elevation, again with its own footing
tie the two leaves together with blue bird stainless screw in ties.
you will probably be allowed to lay 1200 gauge polythene to the floor and cast a new slab, level with the existing, without having to install insulation.
if its a standard flat roof above, this will need upgrading with kingspan celotex or similar.
if its a bedroom then you will need to double board or fireboard, with sound deadening in the ceiling void.
finally if you have a doorway into the garage it will have to be a firedoor with 30 mins resistance. the frame will need intumiscant strips fitting.