Categories

Pouring Concrete in Cold Weather

Question Icon
Posted by: from Gravenhurst
11/21/2021 at 7:26:26 AM

Can you pour concrete slab on bedrock, and pour ICF ground floor walls in Muskoka Ontario in winter?

REPLIES (2)
User Icon
Date/Time11/25/2021 at 3:45:51 PM

Its never idea to do winter pours & concrete needs prep for application so it doesn't crack, you can't just "pour it on a surface" , you will need to put rebar into the bedrock 1st, but yup its done all over Canada, all winter. Concrete suppliers have "winter concrete" and it costs a little more too. Make sure you hire a contractor who knows what they are doing and has the equip. to keep it covered, heated etc. during initial cure.

User Icon
Ian in Edmonton
Date/Time11/25/2021 at 6:55:33 PM

Following are the 'Cold Weather Requirements' described in the National Building Code 2019 Alberta Edition'.

1) When the air temperature is below 5 C, concrete shall be

a) kept at a temperature of not less than 10 C or more than 25 C while being mixed and placed, and

b) maintained at a temperature of not less than 10 C for 72 h after placing.

2) No frozen material or ice shall be used in concrete described in Sentence (1).

3) Concrete shall not be placed

a) Into mud, standing water or snow, or

b) on, against or above any frozen material.

During winter months there is a surcharge for 'winter heat' (not sure if they just heat the water or if it's all the ingredients). If you were to walk into your concrete supplier and ask for 'winter concrete' they might look at you kina funny.

It is common practice (at least in Alberta) to add 2% calcium chloride as an accelerant, however this practice isn't described in the Building Code however the Code does reference a concrete standard (CSA A.23.1:19 - Concrete Materials & Methods of Concrete Construction).

In your region the temperature is so marginally below freezing so as not likely to be a concern about placing concrete over the bedrock; however suggest you check with your municipal authority to verify local (Ontario) Code requirements and accepted practices.

Search the TrustedPros directory and discover the best contractors in your area.

Find your home service pro
Great renovations start with a great contractor.

Since 2004, TrustedPros has been helping homeowners find the right contractor for their home improvements and repairs.

Post Your Project

Within hours you'll be comparing offers from top-rated professionals. It's free to post and you're under no obligation to hire.

 
Trustedpros Inc. does not warrant the accuracy, completeness, safety, legality or usefulness of any Content, or Whether Content is Current and up-to-date, and TrustedPros Inc. Shall have no liability whatsoever with respect to your use or reliance upon any content or for content being removed or otherwise ceasing to be available. Please refer to the terms and conditions of use of this websites for more details.
Categories

Get quotes from top-rated contractors

x