DIY Home Improvement, Remodeling & Repair Forum > DIY Home Improvement > Bricks, Masonry and Concrete > Sealer on exterior of the house




Reply
 
Thread Tools Search this Thread Display Modes
Old 10-10-2009, 12:16 PM  
Rent-A-Fiddler
Junior Member
 
Join Date: Oct 2009
Posts: 3
Default Sealer on exterior of the house

what is the best way and or product to Spray and seal on the exterior of the house which is mainly made of Agrégats / Aggregate to cover the whole exterior of a Duplex



__________________
Rent-A-Fiddler is offline  
 
Reply With Quote Quick reply to this message
Old 10-10-2009, 09:47 PM  
Nestor_Kelebay
Emperor Penguin
 
Nestor_Kelebay's Avatar
 
Join Date: Mar 2009
Location: Winnipeg, Manitoba
Posts: 1,844
Liked 2 Times on 2 Posts

Default

Rent-a-Fiddler:

The best treatment to keep water out of a masonary wall is to paint that wall on the exterior with a latex MASONARY PAINT or an ELASTOMERIC COATING, depending on what the problem is.

The worst thing you can do is seal up a masonary wall to prevent moisture from evaporating from it. That's cuz preventing moisture from evaporating out of the wall doesn't prevent moisture from getting into that wall. The result will be that moisture will continue to accumulate under the sealer, and if you have cold temperatures that result in that moisture freezing, you can have the masonary of the wall crack due to internal pressure. This kind of cracking due to the internal pressure caused by expanding water inside the masonary is called "spalling", and it's characterized by the masonary breaking off in "flat"ish "chips" from the surface of the masonary.

If there is a crack in the masonary that allows rain water to get in, and repairing that crack with brick mortar or whatever isn't feasible because the crack is opening and closing as the building moves and shifts, the best fix is an elastomeric coating. An elastomeric coating is a thick plastic paint that's made of the same plastic as the toy called "Stretch Armstrong". This is a plastic that can be stretched out of shape, but always reverts back to it's original shape once the force keeping it deformed is removed.
So, an elastomeric coating will stretch to span the gap across the crack when it opens, but will shrink back into shape again when the crack closes.

Masonary paints are exterior latex paints that are chosen because of their "breathability", with is the ability of a paint to allow H2O molecules to pass through the paint. The higher the breathability, the easier it is for H2O molecules, but not liquid water, to pass through the paint film. You can consider a latex paint resin as a metal wire scrunched into a ball. As long as the gaps between the wire segments in that scrunched up wire are wider than the diameter of a single H2O molecules, but smaller than the distance between H2O molecules in liquid water, then only individual H2O molecules can pass through the paint.

The whole idea behind masonary paints is that they allow any moisture that gets into a masonary wall to evaporate out of the wall through the masonary paint, but they prevent rain from penetrating into the wall through the paint. Thus, they allow the wall to dry out, but don't allow rain water to penetrate into the wall through the paint.

So, if you want to do something to a masonary wall, be careful what you do because it's easy to get into the trap of thinking that if you prevent the moisture from getting out, that'll stop it from getting in. That's not true, AND if the moisture inside the wall accumulates and subsequently freezes, it can cause a lot of damage to the wall.

Any paint store will sell both masonary paints and elastomeric coatings.

__________________
Nestor_Kelebay is offline  
 
Reply With Quote Quick reply to this message
Old 10-14-2009, 07:04 AM  
itsreallyconc
Senior Member
 
Join Date: Sep 2009
Location: hilton head & atl, sc & ga
Posts: 287
Liked 1 Times on 1 Posts

Default

what is the aggregate ? stucco ? please excuse my ignorance !
__________________
itsreallyconc is offline  
 
Reply With Quote Quick reply to this message
Reply


Quick Reply
Message:
Options

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off


Similar Threads
Thread Thread Starter DIY Home Repair Forum Replies Last Post
Brick facing or veneer on exterior of house I can't tell? mesmyrrhanda Bricks, Masonry and Concrete 1 08-15-2009 03:03 PM
An incognito sealer Kaixadepandora General Home Improvement Discussion 1 05-14-2009 08:43 AM
Help with concrete acid stain & sealer Quick Carpenter Introductions 1 12-24-2007 08:23 AM
porcelin tile grout sealer Ronnie1a General Home Improvement Discussion 5 06-30-2007 04:29 PM
Thread sealer Mudball Plumbing Forum 5 07-24-2006 06:58 PM

Newest Threads

LATEST SPONSOR DEALS