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Building a shop
Jasonb:
--- Quote from: ChriX on September 09, 2011, 12:41:00 PM ---
Could someone take a look at my wall diagram and give me some feedback? Not really sure about the membranes/insulation combo and what order things should go in.
--- End quote ---
You show horizontal weather boarding in which case your battens should be vertical.
Breathable membrain on outside of studwork is fine.
Use the cavity bats in the wall not the lighter rockwool on a roll thats used in lofts etc. If you can afford the extra then kingspan or celotex will give better insulation.
Some say that you don't need a vapour barrier if using plywood but for the little extra cost of a roll of polythene and a few staples I would always fit it and then you have no risk of interstitual condensation withing the insulation. If using celotex then you can tape the joints with foil tape insted of fitting a vapour barrier.
Oh and add a sheet of reinforcing mesh into the slab even with the fibres.
Jason
Miner:
ChriX,
I operate excavators for a living and have done foundation work. You don't want to disturb the ground under where your footings are going with the bucket teeth. Use the flat bottom of the bucket and the bottom of your footings trench should be flat and level. Remove ALL of the loose material from that trench and especially the darker topsoil looking material. If you have to go back in and redig those trenches to get undisturbed and a flat and level surface for the concrete then you need to do so. Without that your footings will crack. I'm 100% positive of that.
Pete
ChriX:
Thanks Jason & Pete - all a great help.
Jason when you say reinforcing mesh - do you mean rebar? This stuff? http://buildingmaterials.co.uk/Rebar/Rebar-Mesh.html
Miner:
ChriX,
Your welcome, But I may have made a bunch more work for you. It's too bad I hadn't seen your first postings. One further thought you may not like. Since it's going to be a shop your going to have heavy objects that the floor needs to support. The material inside your footings needs the same approach too. Any rubble ect needs to come out and down to undisturbed non topsoil type ground. Generally a crushed sand and gravel mix is brought in then mechanicly compacted after the footings are cured. Then the poured concrete floor sits on that. Even with rebar, metal screen, fiberglass ect in the concrete, It needs a firm, stable base to prevent cracks. That's the problem with concrete work, You only have one shot at doing it right so you don't have problems later. If you think you need any other info I can provide, Then feel free to PM me. I certainly don't know everything about concrete work but I know enough for your job.
Pete
Jasonb:
Yes A142 mesh placed mid way through teh slab will be fine.
As Pete says you don't need the hardcore in the bottom of the trench, just good solid sub soil. If it were a building subject to building regs the building inspector would likely make you dig it out, even if you get a bit of rain in a trench they will want all the wet soil ccraped back to firm before you pour the concrete.
The reason for no hardcore is that even if well compacted there will be voids and over time the soil will find its way into these voids causing the footings to settle. Its not so bad on a slab as the loading is over a much larger area but again just throwing in a load of old bricks is not the way to do the hardcore, wants to be crushed conc/brick and well compacted with a whacker plate. Having said that if its just a mini lateh you have then it will be OK, maybe not so with a couple of ton of DS&G.
Jason
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