how to close the concrete roof slab hole ?

Feb 22

I have made a 30cm x 30cm hole in the concrete roof slab to get the AC pipes through it. The slab was already been finished.The slab thickness is 30cm and above it there were foam concrete, bitumen sheet, foam for heat insulation and at the top there are mosaic tiles. how can i make it as before , strong in waterproofing and heat proof. which cement should i use for this work ? and how to make ? seeking your best advice. Thanks.

I would fill the main void with some kind of expanding foam, then after that drys gently cut any access off with out damaging any pipes, and caulk the rest with polyurethane caulk it’s strong, and flexible. They have different colors also.

UGH THIS IS RLY FRUSTRATING ME PLZ HELP????!!!?

Filed under: Foam Pipe Insulation

2 Responses to “how to close the concrete roof slab hole ?”

Lance B, on February 23rd, 2010 at 4:26 am Said:

I would fill the main void with some kind of expanding foam, then after that drys gently cut any access off with out damaging any pipes, and caulk the rest with polyurethane caulk it’s strong, and flexible. They have different colors also.
References :
Charlie C, on February 23rd, 2010 at 4:42 am Said:

just use pressure treated ply, caulking and spray foam filler as necessary.
References :

Foam Insulation 2.0