Award Winning Company Since 1991

Chicago Licensed Masonry Contractor

Masonry Sealing

concrete-blocks-gralak-waterproofingIncludes CONCRETE BLOCKS (CMU), RENAISSANCE STONES, BRICK/STONES, PARAPET WALLS and WINDOW OPENINGS.

CONCRETE BLOCKS (CMU) – CONCRETE BLOCKS (CMU)- Although there are numerous reasons why a buildings water barriers can fail. The most common include CONCRETE BLOCKS known as CONCRETE MASONRY UNITS (CMU).

MUNICIPAL CODE OF CHICAGO

The Chicago Building Code at the “Chapter 13-120 -150. Exterior wall materials” says that “Exteriors walls constructed of concrete masonry units (CMU) shall have flashing, weep ropes, sealants and caulking which prevent the accumulation of water within the wall assembly and provide a means for draining water that enters the assembly to the exterior so as to prevent moisture from passing beyond the exterior wall cladding or veneer and entering the interior of the exterior wall.”

Concrete Blocks are much larger than ordinary bricks. Furthermore, CONCRETE BLOCKS typically have much lower water absorption rates than brick. The CONCRETE BLOCKS have been used in many new construction projects in the Chicago area and they have not been waterproofed, properly in many cases. Our company specializes in the application of siloxane waterproofing agents SEALCOATING cinder blocks that infiltrate and penetrate deep into the concrete blocks substrate and bond chemically to provide a superior barrier against the elements and minimize block’s exposure to water damage.

All split block masonry walls needs to be sealed every 5 to 7 years.

 

There are two different types of silicate products, silanes (PBT) and acrylics, urethanes (Chemtrete).

Gralak project teams apply a PBT product in order to repel water.The PBT changes the capillary forces in the pores of the masonry and is rated “excellent” under vapor transmission due to the fact that it coats the pores instead of simply bridging them. PBT has a higher water vapor transmission than the film formers. The ratings for acrylics vary between “poor” and “good” under vapor transmission because they can cause moisture retention and create a blushing discoloration.

Our Recommended Water Repellent.

Our recommended system for the concrete masonry units is called Enviroseal PBT BASF water repellent.

basf-logo

BASF is the largest and the most reputable chemical corporation in the world.

VOC (Volatile Organic Compound) BASF PBT 118g/L.

 

Competitors: Chem-Trete 375g/L, Loxon 350g/L.

ENVIROSEAL BASF PBT complies with the standards for residential concrete masonry walls: ASTM C140,ASTM E514.

A patented, high-performance, water-based repellent specifically formulated to provide protection for the most challenging CMU’s (Concrete Masonry Units).

Duration time: 5 years.

Enviroseal PBT will not inhibit water penetration through unsound or cracked surfaces or surfaces with defective flashing, caulking, or structural waterproofing defects and the warranties will not be guarantee at the parts of the walls affected by any faulty construction or deteriorated mortar.

The most common cause of premature Enviroseal PBT failure on masonry walls is moisture.
Failure is normally due to elevated moisture levels which soften the exterior coatings.

Advantages of PBT

  1. Environmentally responsible (breathable)
  2. Highest degree of water repellency for CMU’s
  3. Prevents moisture intrusion (high resistance to wind –driven rains)
  4. Superior porous block treatment
  5. No change in treated surface appearance (colorless) and will not alter texture
  6. Deep penetration into substrate
  7. Mildew/fungus resistance
  8. Freeze – Thaw protection
  9. Resistance to UV deterioration
  10. Protection from Acid Rains and waterborne chemicals

Enviroseal PBT for CMU’s will not inhibit water penetration through unsound or cracked surfaces with defective flashing, caulking, or structural waterproofing.

 

“The greenest and the safest water repellent on the market”

 

Coating specifications:

  1. See attachments
  2. Time of completion: weather permitting
  3. Application conditions:
    Temperature: 45 F minimum / 90 F maximum
  4. Humidity: 85% maximum
  5. Application method: Low pressure electrical pump sprayer or brush and roller, accordingly to the surface and recommendation by coating manufacturer.

The brick masonry walls are recommended by Gralak Tuck pointing Masonry Sealing and Waterproofing Contractors to SEAL by the ENVIROSEAL Double 7 for Brick. BASF Building Systems certifies that the VOC of the sealer is 250 g/l. High –performance, water-based, clear silane /siloxane water –repellent sealer designed for dense, vertical masonry surfaces. With long-term protection is transparent, nonstaining and breathable (allows interior moisture to escape without damaging sealer). Environmentally friendly for interior and exterior use. Enviroseal Double 7 for brick will not inhibit water penetration through unsound or cracked surfaces or surfaces with defective flashing, caulking, or structural waterproofing. Gralak Waterproofing Masonry Sealing and Waterproofing contractors use reasonable preventive considerations for the windows and iron or wooden decks around the buildings and for the neighbors adjacent buildings to complete and perform the whole sealing process in a satisfactory and successful manners.

BRICKS / STONES

brick-and-stone-sealing-by-gralak-tuckpointingIf brickwork is not properly maintained, every masonry joint as well as brick can serve as a point of entry for water. Replacement of deteriorated BRICKS/STONES and/or replacing of sealants (caulking) is cost-effective maintenance that helps prevent more serious issues from developing. Brick repairs and mortar replacement (tuck pointing) is a part of the masonry sealing procedures.

PARAPET WALLS

parapet-walls-repair-by-gralak-tuckpointingPARAPET WALLS often have deteriorated and exposed brick. The solution to such a condition is to provide appropriate roof flashing on the backside of the PARAPET WALL, replacement damaged bricks, tuck pointing loosed mortar, resetting the stone/clay caps, and caulking properly. Proper flashing should be visible under the cap stones at top of the parapet walls on the roof. A lot of masonry parapet walls are covered with in-expensive, faulty metal flashing. To protect the walls from the water intrusion, Gralak Masonry contractors may install new capping stones with solid elastomeric flashing system underneath the stones at the top of parapet wall or install coping clay tiles. The capping stones of many buildings don’t have the proper flashing. There are potential water entry points to the entire building structure because the stones are porous too, especially man made stones called Renaissance stones. They are made from the sand and contains up to 90% of silica.

WINDOW OPENINGS

window-openings-sealing-by-gralak-tuckpointingWINDOW OPENINGS cause water intrusions into inner walls from rusted lintels, from damaged flashings (membranes), or old window wood frames and old caulking. Rusting is the most common issue with steel lintels. The wall structure above the lintel may fail if the lintel is rusted. The rusted lintel due to chemical process can grow up to ten times its original thickness which cause the metal to bow and masonry around to crack and shift under severe pressure. Rusted and corroded lintels should be replaced with new one, painted with a rust-inhibitor. New flexible flashing should be installed together with stainless steel drip edges, end dams, termination bars and weep holes.

The elastomeric flashing system should be installed at the top and bottom every window and door opening.

RENAISSANCE ® Masonry Units (RMU)

renaissance-masonry-units-rmu-by-gralak-tuckpointing RENAISSANCE ® Masonry Units (RMU) are high density, severe weathering, Calcium Silicate Masonry Units (CSMU). They can be used for both Full-Bed masonry veneers and various Thin-Bed applications. They are produced for vertical walls in Full Bed (3 5/8″) and various Thin Clad (3/4” – 1 ¼”) applications like ArrisTile, ArrisClip and ArrisPanel. Calcium Silicate has been around for over 100 years. It originated in Germany and is still being produced today. Arriscraft International has been manufacturing Renaissance® Masonry Units since 1949. Arriscraft International warranties Renaissance® and all Arriscraft Stone products for the life of the building.

Renaissance® Masonry Units are man made natural stone. That sounds like an Oxymoron, but what it means is the ingredients are all natural products. There are no polymers, binders, plasticizers or portland cement in Arriscraft Stone products. The basic ingredients are 93% sand and 7% lime. Both these materials are mixed together and pressed into rectangular shapes with over 1,000 tons of pressure. They are then put in an autoclave, where they raise the temperature within the autoclave using steam and the chemical reaction takes place between the sand and lime that fuse together. When the Stone comes out of the autoclave it is over 8,800 PSI with an 8%-10% absorption.

Each stone is within 1/16th of an inch of being perfectly square. This lends itself to intricate design possibilities. Arriscraft Stone products works well with brick in the wall and does not require the extra detailing associated with cement based products. Renaissance® does not require sealing. If the stone is sealed, it voids the lifetime warranty. Unlike some more porous concrete-based products, masonry units comprised from either clay or calcium silicate should not, as a general rule, have waterproof sealers applied to their surfaces.

Their denser, less absorptive structure precludes the use of such sealers. The application of sealers to these materials can in fact retard the natural breathability of the units, and potentially cause damage. As stated above, manufactured masonry products are absorptive, and as such, should not be used in applications where they will be exposed to large quantities of moisture over extended periods of time. Horizontal applications, such as paving, require the use of less absorptive materials, such as Dolomitic limestone, or specialty products such as air-entrained concrete.

All masonry products are inherently absorptive, a necessary property for the formation of a mortar bond. This tendency to absorb moisture, however, also means that moisture from other sources, such as top soil, melted ice and snow, etc. will also be absorbed by the masonry. As those sources of moisture tend to remain in contact with the masonry for much longer periods of time, they will tend to saturate the masonry unit. This saturation can result in unsightly stains, efflorescence, and in colder climates where deicing salts are used, even spalling of the face of the units.

Each stone is within 1/16th of an inch of being perfectly square. This lends itself to intricate design possibilities. Arriscraft Stone products works well with brick in the wall and does not require the extra detailing associated with cement based products. Renaissance® does not require sealing. If the stone is sealed, it voids the lifetime warranty. Unlike some more porous concrete-based products, masonry units comprised from either clay or calcium silicate should not, as a general rule, have waterproof sealers applied to their surfaces. Their denser, less absorptive structure precludes the use of such sealers. The application of sealers to these materials can in fact retard the natural breathability of the units, and potentially cause damage. As stated above, manufactured masonry products are absorptive, and as such, should not be used in applications where they will be exposed to large quantities of moisture over extended periods of time. Horizontal applications, such as paving, require the use of less absorptive materials, such as Dolomitic limestone, or specialty products such as air-entrained concrete. All masonry products are inherently absorptive, a necessary property for the formation of a mortar bond. This tendency to absorb moisture, however, also means that moisture from other sources, such as top soil, melted ice and snow, etc. will also be absorbed by the masonry. As those sources of moisture tend to remain in contact with the masonry for much longer periods of time, they will tend to saturate the masonry unit. This saturation can result in unsightly stains, efflorescence, and in colder climates where deicing salts are used, even spalling of the face of the units.

Each stone is within 1/16th of an inch of being perfectly square. This lends itself to intricate design possibilities. Arriscraft Stone products works well with brick in the wall and does not require the extra detailing associated with cement based products. Renaissance® does not require sealing. If the stone is sealed, it voids the lifetime warranty. Unlike some more porous concrete-based products, masonry units comprised from either clay or calcium silicate should not, as a general rule, have waterproof sealers applied to their surfaces. Their denser, less absorptive structure precludes the use of such sealers. The application of sealers to these materials can in fact retard the natural breathability of the units, and potentially cause damage. As stated above, manufactured masonry products are absorptive, and as such, should not be used in applications where they will be exposed to large quantities of moisture over extended periods of time. Horizontal applications, such as paving, require the use of less absorptive materials, such as Dolomitic limestone, or specialty products such as air-entrained concrete. All masonry products are inherently absorptive, a necessary property for the formation of a mortar bond. This tendency to absorb moisture, however, also means that moisture from other sources, such as top soil, melted ice and snow, etc. will also be absorbed by the masonry. As those sources of moisture tend to remain in contact with the masonry for much longer periods of time, they will tend to saturate the masonry unit. This saturation can result in unsightly stains, efflorescence, and in colder climates where deicing salts are used, even spalling of the face of the units.

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