Gavin’s isoquick foundation on clay soil

[Duncan62]

Literally just asked my SE this too. I'll see what they say.

[gavztheouch]

2 minutes ago, Duncan62 said:

Literally just asked my SE this too. I'll see what they say.

 

Did you manage to get your slab poured? 

[saveasteading]

Do not use short fixings. The first 25mm or so is discounted in calculations. After that it is approximately the square of three depth. So you must keep the depth.

The occasional clash with a bar is normal 

[Gone West]

11 hours ago, gavztheouch said:

Anyone else build timber frame on a structural slab. How did you bolt the frame down?

Our frame was fixed to the slab with 12mm threaded studs bonded into the slab with two part resin.

[gavztheouch]

20 minutes ago, Gone West said:

Our frame was fixed to the slab with 12mm threaded studs bonded into the slab with two part resin.

Did you have rebar where you were drilling? How did you deal with it?

[gavztheouch]

I should mention there is also 16mm glued in threaded rod for the hold down brackets with are Simpson htt4.

 

There is about 27 of these, some are internal for racking walls.

 

 How worried should I be about drilling 140 holes in the slab. Any chance it will make a meaning full crack that will radiate much past the hole itself. Not that there is any alternative really.

[saveasteading]

2 hours ago, gavztheouch said:

How worried should I be about drilling 140 holes in the slab.

It is normal. You are right that it might encourage a crack on that line, but it shouldn't if the concrete is good. And it won't matter anyway.

What are the odds of hitting a bar?  With isoquick perhaps quite high but I don't know your details.

 

The odd rod being cut won't matter either OR the anchor being a tad less deep.   That is an advantage of threaded rod and epoxy...it cuts as required.

But a hit fix will be very much quicker.

 

[Gone West]

3 hours ago, gavztheouch said:

Did you have rebar where you were drilling? How did you deal with it?

There was rebar where the holes were drilled. Used a Bosch concrete rebar cutter drill bit, not used it much though.

[Duncan62]

19 hours ago, gavztheouch said:

 

Did you manage to get your slab poured? 

 

Yes. Yesterday. Garage perfect. House just about ok. Not ideal in places. 

 

Awaiting SE reply re anchors still

[gavztheouch]

11 minutes ago, Duncan62 said:

 

Yes. Yesterday. Garage perfect. House just about ok. Not ideal in places. 

 

Awaiting SE reply re anchors still

That’s good. Are you using the concrete as your finished floor surface?

[gavztheouch]

Total cost for the slab was within £100 of £25000. 

 

120 square metres
 

This was for 

 

isoquick

aggragates

rebar

concrete

labour and pump to pour and finish concrete

 

does Not include my time and the Sewar pipes and under floor heating

 

 

 

[Duncan62]

3 hours ago, gavztheouch said:

That’s good. Are you using the concrete as your finished floor surface?

 

No. Fortunately. We had always planned to finish with resin or micro cement ~3mm layer.

 

What's your finish?

[gavztheouch]

Planning on using the bare concrete. I don’t see why I couldn’t change to resin or micro cement so it’s nice to have that backup

[saveasteading]

5 minutes ago, gavztheouch said:

Planning on using the bare concrete. 

Have you seen any examples?

I am sceptical that it is a suitable finish.

[gavztheouch]

1 hour ago, saveasteading said:

Have you seen any examples?

I am sceptical that it is a suitable finish.

Yeah our architects house has a concrete floor. I have always liked a concrete floor. My only major concern is staining 

[saveasteading]

4 hours ago, gavztheouch said:

major concern is staining 

Was it a ground (as in with a grinder) finish with the surface removed and stones exposed?

I think you must then seal the surface with a special  varnish to make it look bright and cheerful, and to keep stains from soaking in. Even water will emphasise any microcracks, which are unavoidable. Any random cracking would then  look awful, so it is quite a  skill.

4 hours ago, gavztheouch said:

I have always liked a concrete floor

So have I. Very useful for not falling through, even with a forklift. I admit never having tried for a pretty one other than by applying a topping of mineral or epoxy....or tiles.