Originally Posted by Arkitexas
In commercial construction installation of masonry work is not permitted when the temperature is below 40 degrees and falling unless steps are taken to prevent freezing. You could wait until spring or make the mason responsible for maintaining minimum temperatures until the mortar sets. On large jobs that may include wrapping the work with poly and introducing a stream of warmed air into the envelope but this seems excessive for your project. Mortar setting time depends on temperature and humidity levels. At 80 degrees mortar sets in 1 to 3 hours. At 40 degrees it sets in 8 to 10 hours. Pointing work dries faster than new wall work because there is less volume and the repair is near the surface, consequently these times will be shorter. If the amount of work is small, you and the mason may prefer to gamble that it doesn't freeze. I recommend that you require the mason guarantee to repair the work if it fails.
I have never used ChimneySaver but the manufacturer's data sheet says to apply 72 hours after pointing work, at 40 degrees or higher, and allow to dry 2 to 6 hours (without freezing).
Thanks Arkitexas ... this actually is bringing up a few different things that I've been wondering about--how can it be a 1 day job if they are repointing and water sealing? Unless he knew he would have to return a couple of days later for the water sealing.
I haven't spoken to them specifically, but the work is scheduled for the last weekend in October. Last night the low was ~39*F, while it may get warmer there is certain no gaurantee of that, and it could easily be in the 30s that week.
I had a few estimates done and one of them did tell me that re-pointing work may need to be delayed until spring, but I think that was an attempt to get me to agree to the work on the spot.
When I call to confirm the appointment I'm going to ask two specific questions:
1) Is there any issue with the repointing/recrowning if the temperature outside is in the 30s/40s? And do you guarantee that work for any specific length of tme?
2) Do you intend to apply the water sealant the same day or come back to apply it days later after the repointing is set?