 The Problem1. Paint is peeling from masonry surface or is undesired 2. Paint is causing damage to masonry Paint has been used to cover masonry for many years and has been used as a protective coating for masonry that is beginning to show signs of deterioration. It has also been used when porous masonry became dirty from pollution. It may have been been painted due to repairs made to the building which caused a mismatch in masonry. While some historic buildings were built with the intention of painting the masonry for architectural design purposes, most historic buildings were not. Under many circumstances, removing paint properly from a historic masonry structure will bring about dramatic visual improvements and will help prevent future problems associated with paint on masonry. We can help determine the proper cleaners and protective treatments for historic brick that will allow the vapor permeability that is necessary while preserving the beautiful exposed historic masonry. The SolutionStep 1: Remove paint with application specific strippers to preserve integrity of underlying masonry.
Step 2: Clean and repair exposed masonry as needed. Step 3: Inspect the newly exposed masonry to determine if protective treatments are appropriate. Alternate Solution (if paint is appropriate) Step 1: Same as step 1 above. Step 2: Same as step 2 above. Step 3: Paint with breathable masonry paint. Contact: jdunn@masonryrestorationkc.com AllianceMasonryRestoration.com 1-913-742-1516
0 Comments
 The ProblemMasonry is often seen as a permanent building material with no maintenance required. While it is true that brick and stone are very durable and lowmaintenance, they are not maintenance free! Hardness and chemical properties of the masonry material utilized on the building (e.g. Soft brick/hard brick, sandstone/granite) will dictate the amount of maintenance required. The Best defenses against masonry deterioration are a maintenance plan which includes checking the building’s waterproofing, periodic cleaning, and re-pointing where necessary. However when deterioration starts, there are methods to repair and stop further damage. There is a long list of causes for masonry deterioration that includes, but is not limited to:
The SolutionThere are several approaches to solving the problem of deteriorating masonry depending on factors including structural importance of the unit(s) affected, ability to find suitable replacement units, and the extent of the deterioration.
Among the repair options are:
jdunn@masonryrestorationkc.com AllianceMasonryRestoration.com 1-913-742-1516  The Problem1. Mortar that is cracked, missing or deteriorating. 2. Mortar that has been pointed (tuckpointed) improperly causing adverse effects. Masonry that is experiencing mortar failure is subject to the adverse effects of direct water penetration and a weakened wall. The obvious weakening that occurs is from a lack of material (mortar) between layers of masonry which derives its primary stability from the weight of the material above it. The freeze thaw cycle causes rapid expansion and contraction within a wall which can cause visible problems such as spalling and in extreme cases cause complete disintegration of the masonry unit. Modern mortars are much too hard and water resistant for re-pointing old masonry walls. When these mortars are used for historic masonry walls, the long term effects can be disastrous. Not only do modern mortars create a potential detraction from the historic character of the wall, they can actually cause the masonry units to fail. Mortar should be a softer material than the masonry around it. If there are stresses on the wall from water or building movement, the mortar is considered a “sacrificial” material. Meaning, if there is excessive movement in the wall, the mortar should fail first hopefully cushioning the masonry units around it. It’s certainly preferable to re-point mortar than to replace broken masonry units. The Kansas City area is in one of the worst freeze/thaw cycle zones in the country. During winter, temperatures often fluctuate above and below the freezing point. This allows water to enter problem spots and cracks and re-freeze, causing expansion and breakage problems for our brick and stone structures if they are not maintained. The SolutionIf there are cracks, missing bricks, and or crumbling masonry/mortar joints, these conditions do require maintenance which includes Re-pointing.
Re-Pointing is the repair process of removing old and corroded mortar from around brick or stone to a correct depth without damaging the wall or the masonry unit. Then “pointing” or placing, compacting and tooling the correctly formulated mortar to the wall being repaired. Done correctly, a pointing job will last many years, enhance your building’s appearance and will act to prevent water damage and help stabilize the masonry wall. Contact: jdunn@masonryrestorationkc.com AllianceMasonryRestoration.com 1-913-742-1516 The ProblemMasonry units subjected to pressure or lack of adequate support are prone to cracking and buckling. This pressure can include but is not limited to:
The SolutionBoth cracks and buckling can be addressed by using various methods of structural reinforcement along with pinning, and grout and epoxy injection methods.
Just filling a crack in a masonry building with mortar rarely works as the problem is usually an underlying issue and the integrity of the masonry units have been compromised. Contact: jdunn@masonryrestorationkc.com AllianceMasonryRestoration.com 1-913-742-1516 The ProblemOne of the greatest challenges with masonry buildings is water entering the building envelope, causing freeze-thaw damage and other problems such as mold. Water sealing would seem like the obvious solution and is one of the most misunderstood and damaging treatments for brick buildings. Older sealers and paints created a film that did not allow water into the building and created a surface barrier. In time, these coatings peel off the buildings creating an eyesore. Certain coatings cause the outer layer of masonry to be pulled off the building with it causing damage. Even greater damage occurs when the water is trapped in the wall, causing freeze/thaw damage. Current masonry “sealers” are not really sealers at all but rather are water repellents that penetrate into the surface and usually do not alter the appearance of the building. Water vapor can both enter and exit the structure as it normally would due to the molecular structure of the repellant. These repellents do prevent water in liquid form from entering the structure and allow water vapor out. However, water repellents can also trap water in liquid form inside a building envelope. Most historic buildings do not require water repellents and incorrect use can cause more damage than they prevent. They should be considered only when it is deemed necessary to preserve very soft absorbent brick or in certain areas of a structure at higher risk due to higher exposure to weathering. Rising Damp (water entering building from the ground by capillary action) can cause waterproofing problems as well as can coping, parapet wall, and cap failure. Alliance can partner with you in solving these often complex issues. The SolutionThere are a myriad of potential issues that can cause waterproofing problems in masonry buildings so there is no one-size-fits-all approach to water management for masonry.
Alliance Restoration and Preservation Services can assist you in correcting the waterproofing challenges your building brings. We offer solutions in flashing and sealing as well as parapet and coping caps. Foundation treatments and water diversion solutions are all part of a comprehensive plan for your buildings’ longevity. Contact: jdunn@masonryrestorationkc.com AllianceMasonryRestoration.com 1-913-742-1516 The Problem Since nearly all masonry products are porous, it’s normal to expect that through the course of time it will be soiled by pollutants around it. Certain types of soiling are more damaging than others, which may be more of an eyesore than immediate risk to the building. Cleaning masonry with the proper gentle techniques can dramatically improve the appearance of the building while allowing inspection for other issues that can be curbed before becoming obvious and costly problems. There are many possible ‘offending’ elements usually acting in tandem that must be treated differently and with care. These include:
The Solution
Contact: jdunn@masonryrestorationkc.com AllianceMasonryRestoration.com 1-913-742-1516 |
AuthorJoshua Dunn is the owner of Alliance Restoration LLC, a Kansas City based masonry restoration contractor and consulting service that focuses on traditional methods in masonry construction and up-to-date preservation techniques to maintain our built heritage. Archives
March 2017
Categories |
RSS Feed
All Contents Copyright 2015, Alliance Restoration LLC. All rights reserved.
