Use of sbr

Patio flagstones (slabs), concrete flags, stone flags including yorkstone and imported flagstones.
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r44flyer
Posts: 103
Joined: Fri Mar 12, 2010 4:28 pm
Location: Birmingham

Post: # 82480Post r44flyer

Is it necessary to use SBR both in the mortar mix and as a bond bridge slurry? Could I get away with just the bond bridge?

I'm worried about its effect of reducing the working time of the mortar which, for a novice, might not help me. Though I do see the benefit the bond bridge will offer in ensuring a sound bed.

If I do add it to the mortar, the mix ratio states 2.5-5l per 25kgs cement. Does that mean per sand/cement mix, or per amount of cement added to the mix. The former means I'll need gallons of the stuff?!

Thanks!
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lutonlagerlout
Site Admin
Posts: 15184
Joined: Fri Aug 04, 2006 12:20 am
Location: bedfordshire

Post: # 82485Post lutonlagerlout

i just put about 100ml in per mix with the water
so far that has worked good for me especially on steps and overhangs
LLL
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Carberry
Posts: 1366
Joined: Fri Apr 15, 2011 9:05 pm
Location: Edinburgh

Post: # 82489Post Carberry

2.5L is way over the top. As LLL says a much smaller amount does the job.
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