Removing Portland cement and repointing an old brick home using NHL 3 5
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- Опубліковано 5 гру 2021
- This 19th century brick home was repointed using Portland cement which reduced the vapor permeability and caused water leaks. We repointed this side using the appropriate Natural Hydraulic Lime 3.5.
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Very good information. I made the mistake of using mortar *caulk* in deteriorated/missing mortar joints. After five years, those same joints are now showing signs of moisture trying to get out (small cracks alongside joints). There are cracks in my plaster walls (interior of house) corresponding to those mortar joints. My house is 75 years old. So I'm going to remove the caulk and replace with the hydraulic lime.
Never knew how important mortar joints are and how careful we should be replacing them. Thanks so much!! 🙂
Wow - I’ll never say I can’t point again…. That looks a seriously rough/rushed finish. 😂
What about the foundation? Doesn't the NHL 3.5 stay wet too long when it's used underground? How do you protect the NHL 3.5 for a historic foundation of the same type of construction?
As long as it has a chance to cure, it should be fine underground; but it really depends on a lot of factors, especially if there are water issues there.
So if someone wants to apply a stucco to this brick what kind of stucco does it have to be? I am assuming that it cannot be a portland cement/sand mix but a NHL 3.5/sand mix.
How do you know if the bricks on a building need a lime mortar or will be fine with a cement mortar? I've got a shed with bricks probably not more than 150 years old...
Bricks that age you need lime
While repointing and filling of big cracks in very old walls of natural stones, which will be more stronger and durable only lime without mixing sand or any other things or Lime mixed with same quantity of sand or double quantity sand then Lime ? I want to make my very old building more strong and durable. Please guide me
Hi I do lime repointing in the UK
What make of NHL 3.5 do you use in the us
It looks like they are using some nhl from Spain,
Is there a best way to remove cement mortar? Trying to reuse bricks from a 1980s house.
What sand did you use. Building sand or sharp sand?
On the real historic buildings with Lime putty, I think the sand is more course and not super fine.
I did tuckpoint in my house built in the 60 s
I used brixment cement, should I be concern on having the same problem?
Brixment type N
For tuck point
Thanks for the reply
Most likely by the 1960s the bricks used to build your house were substantially harder than the ones in this video which are from 1880's.
Harder bricks can withstand harder mortar. Older bricks need a lime based mortar because they are softer. First you need to know how hard your bricks are and then you can determine if the mortar is correct or not. If the bricks are showing damage but the mortar isn't that is a sure sign of a problem.