The Brew Cabin

Posted: **Tue Aug 14, 2018 8:02 pm**

Hey peeps,
Could anybody give advice regarding shuttering for a concrete pour....?
Iâ€™m in the early stages of making a concrete base for a garden room which will be about 5x5m.

I donâ€™t want to dig down anymore (I need to raise it up if anything), as I can get enough slant for a toilet waste pipe).

Is it ok to build up shuttering using pressure treated 9x2â€™s, which will be securely staked into the ground, then use a whacker plate to tamp down 3â€� of mot type 1....and then fill the remaining 6â€� with poured concrete.

But my main query being - is it ok to leave the shuttering in situ so it holds everything in place - especially the m.o.t?

Sorry if my details area bit vague - I can give more details if it helps provide an answer.
Any help/ advice is very much appreciated.

Posted: **Tue Aug 14, 2018 11:02 pm**

no
eventually that shuttering will rot and the type 1 will disperse
you need a toe in the concrete down to below ground level
also a DPM will stops salts getting into the concrete
and mesh

LLL

Posted: **Wed Aug 15, 2018 6:30 am**

see here
Could use the deeper edgings to contain mot.

Posted: **Fri Aug 17, 2018 10:43 pm**

Thanks guys...

I'm not sure what a 'toe' means ???

I have a DPM ready and waiting....mesh is on order.

Edging stones is a great tip - thanks

Posted: **Sat Aug 18, 2018 10:07 am**

A toe is a part of a cantilevered slab for retaining walls. You have a heel which is a lit wider than the toe and takes the backfill which so the weight keeps it from tilting. The toe is on the front of the slab which can. It is an engineering process which involves rebar in the base slab with raiser bars sloping up into the wall and starter bars sticking out of base slab. We use toe terminology loosely on an ordinary footing.

Posted: **Sat Aug 18, 2018 7:49 pm**

Could I make a 'frame' using those edging stones, and hold them up with rebar rods behind them...then fill this 'edging stone frame' with the type 1 and whacker plate down.
Then, place my timber shuttering on top of the edging stone frame (also held in place securely), which can then be filled with poured concrete?

Posted: **Sun Aug 19, 2018 3:05 pm**

Slabhead your overthinking this. Sounds like you only need 9" just place a shutter and concrete up against it. Tamp the concrete inside shutter with some 4x2 and bang the sides with an hammer to help settle concrete and give a good finish to the upstand. Your concrete upstand should be just concrete. The slab can be laid on mot. Good luck i'm sure you'll be fine.

The Brew Cabin

Query about shuttering for concrete - Any advice appreciated...