[kjmass1]

I have a 75 year old slab roof on a garage that is leaking in 2-3 cracks.

Should I grind them out and use a poly sealer or some sort of epoxy resin? Do I need the structural bonding or just a good seal?

Thanks.

 

[stadry]

we 'chase' the cracks w/u-shaped diamond blade on a 4" grinder then seal w/high weight methyl methacrylate (hwmma),,, when that's done, we install 3/8" tape in the bottom of the sawed slot & seal w/polyurethane joint sealant,,, don't complain about the $ OR that you can't find it in your local apron/vet store,,, we do this work for a living.

following materials will both 'weld' conc back together & stop leaks:

http://www.transpo.com/roads-highwa...rack-sealers/rapid-cure-mma-crack-sealer-t-78

http://usa.sika.com/en/repair-protection/02a002/02a01302a013sa56.html

http://www.emecole.com/pages/Emecole-555-Concrete-Crack-Repair-Polyurea.html

finally there's ccs - http://www.concreteconstruction.net...aces/chemco-systems-ccs-epoxy-healer-sealer_o

remember proper prep is the key to a lasting repair while anything less is just a temp patch til it rains again,,, good luck !

 

[kjmass1]

So you seal, tape, seal again?

Any reason to use sand or silica?

Thanks for the info very helpful.

 

[stadry]

since the stuff's not as cheap as roofing gunk, we dribble some of the hwmma into the crack along w/CLEAN silica sand to form a block against excess leakage,,, when that cures, we then apply a 2nd coat bringing the level up to grade

i'm changing the originally posted method based on your pics - don't bother w/sealing a 2nd time w/polyurethane sealant,,, IF i were you, i'd pressure wash the slab 1st using 3,500psi, 4gpm, & turbo nozzle - we would

 

[kjmass1]

You should have seen it before I cleaned it yesterday haha. Scraped off remaining tar and cleaned it up and will pressure wash. Thanks!

 

[stadry]

this stuff is good too: http://www.concretemender.com/wp/
convenient packaging too

 

[kjmass1]

this stuff is good too: http://www.concretemender.com/wp/
convenient packaging too

That's what I originally had looked at- only sell to pros. Is there a similar off the shelf product that I can purchase?

 

[Canarywood1]

That's what I originally had looked at- only sell to pros. Is there a similar off the shelf product that I can purchase?

They sell to homeowners.


http://www.emecole.com/pages/slab-crack-repair-kit-small.html