Pocster

Hang on ! @Nickfromwales is on my job next - said he fancied a challenge ?

Worth a call ?? https://www.excelroofingandcladding.com/liquid-applied-roofing-systems/

Yeah I know ! Ring Cemex Peter and argue with them ? Perhaps they “backdown “ when you ask if it is 100% waterproof to avoid liability. He also asked me what I meant by “waterproof” - my response was 100%

Called Cemex out of interest about their waterproof concrete. He blurbed on quite a bit and CONFIRMED on it's own it is NOT waterproof - but can be part of a waterproof system. He waffled a lot! ; very technical - so erm yeah; not helpful!

Just another thought. Why do I need either GRP or EPDM when you can tank; for example: https://www.permagard.co.uk/basement-waterproofing/cement-tanking

Architect gone very quiet as I take my pavers up......

I used Cedral Horizontal not too bad . Vertical a real pain !

????????

Put the cobra down ! ? Where does this fit in the plan ?? ??

But that means driving over grp - my architect ‘s nightmare . Might be more acceptable because it’s not at floor level .... Could even grp over the slab and EPDM - everyone’s happy then !!

All suggestions welcome ! Non standard build requires non standard solution!

Car parking area is essentially a giant upstand - but with edpm just on top ....

Exactly ! . But if *just* the top of the parking slab was EPDM it could overlap the grp . EPDM just to keep Architect happy - then driveway pavers ontop this so ‘tub’ ; sides ; upstands ; side of parking slab all grp - continuous .

Or perhaps just EPDM over the parking slab ( to keep architect happy ) . So EPDM overlaps grp on sides of parking slab . Sensible ? ??

Hang on ! Am I being thick !! What’s wrong with making a concrete parking slab and then simply grp up the sides of that direct to the floor . No need to grp under it ! Though grp would go over the parking area - that might be an issue ... ?!?!? ?

Might come to that just to save on height

This is what I thought . All depends on steel thickness required .....

The galvanised steel ‘mesh’ would be on stilts I.e raised away from the water

Wish you were my architect @JSHarris

Went back to this thread Sigh!; still none the wiser. The guy that visited said he had no real idea how to 'finish' the edpm at the edges - but with grp it could be done. ( once he recovered from his obvious shock) If I'm 'floating' the tiles on pedestals ; why can't I float the parking area also?? on a special purpose construction??? This then solves the issue of car/concrete on grp (or edpm) Ignoring 'depth' issues - what would theoretically be wrong with say a steel structure to support the driveway?

Comes up easily enough ?

Yes ; layers are correct So I’m stripping this back to the 30mm concrete ( defective EPDM is below that ) Why oh why did he ignore grp so dismissively.....

Than I have NO idea why my architect ignored it as an option !!! ???? One problem though what would go under the parking area for the grp to fix too ? I assume it can’t be applied direct to concrete ???? Sigh ! 2 steps forward ; 1.98 steps backwards ....

I guess the question then is can you put concrete and weight of a car on it ? . Question for SE rather than architect I suspect .....

Quickly googling grp it does suggest it needs to be allowed to expand / contract . Is that an issue for a slab of concrete with a car on it ? Who knows what my architect thinks ! I did think of a solution ( assuming car and concrete on grp are an issue ) . Could build off the 30mm concrete and have a steel structure just for the car area . Then grp /EPDM wouldn’t be under it . But I’m just shooting air at this point ..... ?