Garage conversion floor

[Ian H]

Ok, thanks. I’ll tape the joints and weigh it down

 

[John D v2.0]

you would need a dpm or similar on top of the insulation to stop it floating away, once one lifts and the concrete goes under I'd have no ide how to solve that issue.
The upstand also helps to stop thermal bridging into the ground via the wall, in reality the thermal resistance of 3m of soil is not far off 50mm of celotex, just it has a huge thermal mass. So still worth having it.

 

[Ian H]

My upstand will be half in the floor and half behind the skirting boards:

 

[mrgobby]

So long as you can get a decent fixing in for the new skirting should be fine. Tape all joins to reduce risk of liquid in the concrete getting through/past or sheet over the insulation as a second membrane.

 

[Ian H]

Going to get the concrete delivered on Saturday. First quote for 1.3cu/mtrs was £249 I thought that was a bit steep then the next one was £235 but couldn’t do this Saturday.

Then thought to mix it myself would need 3 bulk bags and 15 cement so not far off £200 anyway.

 

[mrgobby]

Could be a minimum delivery charge involved but assume that's inc VAT. All you can do is phone around, I wouldn't personally want to hand mix it I'd go volumetric lorry every time, if that is a premix price then try a volumetric supplier, they might be more flexible on price as they deliver part loads all the time because it's mixed on the lorry.

 

[Ian H]

That was a premix including VAT

I’ll try a couple of volumetric ones tomorow. I did ask them what if I needed more or less, they said less was easy, they could take away the extra, more would be a problem because they would load the exact amount.

 

[cdbe]

I found bettamix from Bury to be the cheapest (but not by much), I paid £138/m inc Vat. But they have a minimum order of 3m (don't know whether they just won't do less or would but charge you more).

 

[Ian H]

I just got a better price from Creamy Crete in Rochdale, £150 plus VAT for the first cube on the volumetric and any additional charges at £100 per cube so 1.3cube at £216 and no problems if i’m over or under.


Quick question, if my concrete is going to be 125mm thick would you add another 25mm of insulation over the existing 100mm or have the concrete thicker?

 

[John D v2.0]

Personally I would probably go for the insulation, i think it's slightly more expensive per cubic metre, but it would have a good effect on the thermal efficiency.

 

[cdbe]

Bargain! How can you go wrong with a name like that!

 

[Ian H]

I overtook their mixer on my way to Denton this morning and noticed the 01706 phone number

 

[Ian H]

I didn’t manage to get more insulation so have thicker concrete.

What a mess, I should have done the floor first not last

 

[catlad]

You must love that GTI that's all I can say going to all that trouble.

 

[Ian H]

You must love that GTI that's all I can say going to all that trouble.

I’m going to build a new garage on the side for that, this integrated one was too narrow