New (2nd) build in Brisbane

[oasiscdm]

Re: New (2nd) build in Brisbane

Looking good. Nice work. not far form moving onward and upwards.

[applor]

Re: New (2nd) build in Brisbane

Were in the hell did you come across those " clip thingys" on the steel?

You can buy them from Bunning's. They are called trench chairs.

Whites On-Site Trench Mesh Reinforcing Bar Chair - 20 Pack I/N 0910179 | Bunnings Warehouse

I thought I'd give them a go after the dramas I had with the normal rebar chairs from the last WFO suspended slab with the big round bases.

I cut the bottoms off so that they'd sit lower at the height I wanted.

If you look at the attached picture in my very first post you will see I also used them for my corner slab.

Highly recommend them.

[Greenman]

Re: New (2nd) build in Brisbane

Very tidy work. Looks good but the wire and brick chips do the same job.

It is nice to see tidy work though.

[cobblerdave]

Re: New (2nd) build in Brisbane

G'day
Well as expected that's a neat piece of work well done!
Were in the hell did you come across those " clip thingys" on the steel?
I'm feeling positively prehistoric using tire wire and brick chips as chairs
Regards dave

[applor]

Re: New (2nd) build in Brisbane

Pour went well.

Bit of leftover concrete so we filled the blocks up to the top which wasn't planned/necessary.

[cobblerdave]

Re: New (2nd) build in Brisbane

G'day
I've even checked out the underside of that slab. You know I can't remember! But it's doesn't have any bleed by at all so I must have. Can't find any evidence of tape anywhere though can't even find any evidence of those taped melamine.
Regards dave

[applor]

Re: New (2nd) build in Brisbane

I can see all your tape across the board joins but can't see any around the edges joining the block work.
Taped on the underside?

[cobblerdave]

Re: New (2nd) build in Brisbane

G'day
See taped! lots of seams so I could get that melamine out from around a central pillar. Not a dribble.



Simple, available, and above all works!

Regards dave

[david s]

Re: New (2nd) build in Brisbane

The standard approach in the construction industry is to sue an acrylic mastic

The trouble with that approach is that it takes so long and can be very expensive if you don't win.

[Toomulla]

Re: New (2nd) build in Brisbane

The standard approach in the construction industry is to sue an acrylic mastic

[applor]

Re: New (2nd) build in Brisbane

I had considered caulking the seam with silicone though I am concerned it will adhere to the formply and the surrounding block too well and I would struggle to get the formply out.

I can always lever the formply off though, since I designed my pour/front lintel so the formply could be removed forward out the front. Avoids problems where the formply doesn't want to drop down after removing the supports.

My other option was to use blue-tac as a filler.

Do you think blue-tac or silicone would work better?

[Gulf]

Re: New (2nd) build in Brisbane

Yes but the question is where to use the tape. If I use the tape on the topside of the formwork to the side of the blocks, the tape will be stuck into the concrete and won't be removable.

If I tape from the underside I could get concrete leaking down the side of the formwork until it reaches the tape on the underside - so there will be 17mm of concrete stains (the thickness of the formply)

Understand what I mean?

Place the tape on top of you blocks. But, only lap about 3/8ths of an inch up on to the form. You can later cut the tape with a utilty knife. The tape that remains between the blocks and the slab will be ok.

Another option would be to caulk the seam. That is, if you allow enough time for it to dry, before the pour .

[applor]

Re: New (2nd) build in Brisbane

Yes but the question is where to use the tape. If I use the tape on the topside of the formwork to the side of the blocks, the tape will be stuck into the concrete and won't be removable.

If I tape from the underside I could get concrete leaking down the side of the formwork until it reaches the tape on the underside - so there will be 17mm of concrete stains (the thickness of the formply)

Understand what I mean?

[cobblerdave]

Re: New (2nd) build in Brisbane

Gday
Use that gray plastic "gaffa" tape to seal the edges of your formwork, nothing will bleed through that. Leave any screws proud of the surface and tape them as well. Makes them easy to find and you cant fill the heads with concrete either.
Regards dave

[applor]

Re: New (2nd) build in Brisbane

Spent Friday and Saturday finishing the block work.

Sunday I spent a good hour or more cleaning the mortar again. I was tidier this time - some blocks hardly required any cleaning, while my last batch of mortar was too wet again and they needed a bit more.

Then bought a masonry blade for my angle grinder so I could cut the tops of one side of blocks to get the rebar in.

I will be installing all the supports for the suspended slab, installing rebar etc. tomorrow morning ready for the pour tomorrow afternoon.

My only concern is wet concrete seeping down the side of the formwork. it's only a 1-2mm gap at most on a couple of parts so quite tight - nothing big will get in but it may stain the block work.

Overall I am happy enough with things so far. I am a perfectionist so will never be completely happy with the block work but it is solid and level, good enough. The back side isn't quite a straight line though (not shown) because the concrete isn't quite flat and also because my first run of blocks for the WFO area were a bit thin on mortar.