filling holes in concrete floor

[BigAl]

The plumbers has had to chase out some copper pipes that were laid in my concrete floor. Probably 4 inches deep, and 4 foot long. How do I fill them? The area is in a doorway, so will have heavy traffic. I have a 4-1 readymix bag ready to go - do I need to pva the hole first, or just wet the sides of the hole? Ta.

[david campbell]

use a s.b.r(tile bonding ) slurry mix 3/4 :1 should do

[BigAl]

Thanks, can you break down what an SBR slurry mix 3/4 :1 is?

Is it a 4:1 mix of cement/sand with SBR in it? How much SBR? Ta

[diamondtiling]

Hi Al, are the pipes still exposed? If so you need to wrap them up mate, cement based products will attack them and could cause leaks.

[BigAl]

Hi Al, are the pipes still exposed? If so you need to wrap them up mate, cement based products will attack them and could cause leaks.

Yep they are wrapped mate

[BigAl]

Thanks, can you break down what an SBR slurry mix 3/4 :1 is?

Is it a 4:1 mix of sand/cement with SBR in it? How much SBR? Why does it need SBR?

[diamondtiling]

Thanks, can you break down what an SBR slurry mix 3/4 :1 is?

Is it a 4:1 mix of sand/cement with SBR in it? How much SBR? Why does it need SBR?

Because you are going to cover it with tiles.

[BigAl]

But what exactly is a SBR slurry mix 3/4 :1?

[BigAl]

Thanks, can you break down what an SBR slurry mix 3/4 :1 is?
Is it a 4:1 mix of cement/sand with SBR in it? How much SBR? Ta

Thanks, can you break down what an SBR slurry mix 3/4 :1 is?

But what exactly is a SBR slurry mix 3/4 :1?

Anyone?

[doug boardley]

it's sbr with cement added Al

[doug boardley]

to fill the trench I'd use a rapid set flexible adhesive mate, that way there's no delay in waiting for your infill to dry and cure

[whitebeam]

An sbr slurry mix I do with cement and sbr about 50-50, fairly wet just to make sure the new screed bonds to the existing floor.

Don't leave the slurry to dry where you repairing, have some screed mixed up then slurry, then lay screed so it bonds together.

[BigAl]

it's sbr with cement added Al

Still confused. I know SBR is an additive. put it this way - What do i put into a bucket and how much? Thanks.

[BigAl]

You got there before me whitebeam. Thanks. So NEAT SBR with cement. The hole is 4 inches deep and 4 foot long.

I've had a few answers to this from builders and forums - which is right?

1. Dry mix of gravel sand cement
2. Fill with leveling compund
3. SBR slurry mix
4. SBR slurry then screed over top while still wet
5. 4:1 mix poured in after wetting the sides.

[diamondtiling]

An sbr slurry mix I do with cement and sbr about 50-50,

As Whitebeam has said.

[whitebeam]

A cup full of sbr then add cement to bulk out a little but not to stiff and mix thoughly.