Concrete Garage roof

[expat paul]

This is a bit long sorry.

I have a problem with a flat concrete double garage roof (8m

x 7m) ie cracked and therefore leaks, should have repaired this last year [Www]  It's the thin screed, which has cracked and is very easily removed so I can start

from scratch, the roof itself is constructed by a precast T beams and blocks.

The roof is at garden level so I would like make use of it as a

terrace/BBQ area.

 

My question is, what is the best method to redo it and make

it waterproof, I have had many differing offers of advice many of which

contradict each other, so am looking for a difinitve way forward please.

 

So far I have been advised

1. remove exisiting screed, jetwash beams and blocks, apply

a layer of self-levelling compound brushed well in, to lock in the blocks.

2. apply a waterproof layer,  which could be  'bitumen

type' paint or, 'epoxy' trowel on mixture, or lay-on membrane.

3. 5cms of concrete, 2° slope, either, fibre reinforced, or welded

mesh reinforced, or both, plus, with or without waterproof admix.

4. forget stage 2 before laying concrete but do it after.

5. lay tiles using flexible water resistance adhesive and

grout

 

Products suggested      Grace Construction                   Bituthene 3000

                                   Sika                                          SikaDur 32     SikaTop 77

                                   Schluter                                     Ditra-Drain          

I am also laying a base for a future shed so will order

ready-mix hence the suggestion for admix.

 

Anybody point me in the right direction with method and

products please,

thankyou for your patience.

 

Paul

[BIG MAC]

1. remove exisiting screed, jetwash beams and blocks, apply a layer of sand and cement slurry brushed well in, to lock in the blocks.

2. apply Bituthene or equal approved to form a water resistant layer..

3. 65cms of concrete, 2° slope, either, fibre reinforced, or welded mesh reinforced, or both, plus, with or without waterproof admix.

4. Nah.............

5. lay tiles using exterior grade adhesive and grout

 

 

[expat paul]

Thanks [:D]