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Posted: Sat Dec 08, 2012 9:12 pm
by exoticpete
well jack frost has arrived need to point a patio when the temp comes up a little bit question is should I go for trusted 3:1 SBR mix or add frost proof and lose the SBR..?
Posted: Sat Dec 08, 2012 10:14 pm
by lutonlagerlout
just wait for the correct temp and cover with hessian
my mate lost a load of brickwork this week due to an overzealous belief in the wonders of frost proofer
LLL
Posted: Sun Dec 09, 2012 8:43 am
by exoticpete
Cheers luton thought as much, the problem is when its dry it freezes, and when its mild its bloody raining 
Posted: Sun Dec 09, 2012 10:49 am
by London Stone Paving
I was also planning to point a chimney befor Christmas. How many milder days do you generally need for the mortar to go off?
Steve
Posted: Sun Dec 09, 2012 11:04 am
by Tony McC
It's usually 24 hrs @ 3°C and rising but I'm always happier when it gets at least 48hrs above 5°C
Posted: Sun Dec 09, 2012 12:01 pm
by lutonlagerlout
mortar is especially liable steve as it is thin and on a chimney exposed
easipoint goes off fast 1 -2 bags does a chimney but you would need to triple wrap it in hessian and it still might go
LLL
Posted: Sun Dec 09, 2012 9:15 pm
by London Stone Paving
I thought that would be the case tony, I've left it a bit late now. Is it ok to grind out and wait for a mid couple of days? Or would that undermine the stability of the chimney?
Posted: Sun Dec 09, 2012 11:07 pm
by lutonlagerlout
how bad is the chimney steve?
is it still going to be used?
normally for a chimney to warrant repointing most of the existing mortar has failed already and gone
send us a pic if you can
cheers LLL 
Posted: Mon Dec 10, 2012 7:18 am
by GB_Groundworks
we laid some big saddle back copers the other day with frost proofer and sbr in the mix, the newer chlorine free frost proofers reading the label are claiming depending on how much you but in -4 to -8 degrees working temperature if i remember correctly will check, we were just around the 4 degree mark, had the thermometer out with the brickies
Posted: Mon Dec 10, 2012 11:04 am
by London Stone Paving
lutonlagerlout wrote:how bad is the chimney steve?
is it still going to be used?
normally for a chimney to warrant repointing most of the existing mortar has failed already and gone
send us a pic if you can
cheers LLL
Will try to get a piccy. Its a bit difficult these days because I leave the house in the dark and get home in the dark. I would say about 40% needs re-doing. It was picked up on the building survey when we bought the place. I'm planning to sell it in 12 months, so am assuming it will be picked up again when we come to sell
steve
Posted: Wed Dec 12, 2012 2:37 pm
by simeonronacrete
If mortar works HAVE to be done at low temperatures we have prebagged mortars which work down to -10oC but they're expensive. Colours may also differ to your "normal" mortars.
But they're there as an option.