Water Proofing

Water-Proofing / Sealants

One of the biggest flaws in a stucco system is the lack of sealants.

Chances are, your stucco home is not updated with the properly water-proofed, sealed, and/or flashed. The most common problem areas are where stucco meets windows and trim, around penetrations to the stucco (i.e. light fixtures, hose bibs, flashings), and at places where stucco meets a dissimilar surface (i.e. siding, brick, stone, wood, etc.)

Without proper sealant, water can seep into crevices and cracks and cause considerable damage, which cannot always be immediately seen until after the damage is already done.

Monolite Stucco Systems personnel will inspect your home to locate all areas that are not properly caulked and sealed.

Once these areas are identified, they will use a sealant (caulking) appropriate for the substrate to create a water-tight perimeter.

Monolite Stucco Systems uses (Sherwin Williams)Loxon S1 & Loxon H1, and (BASF)NP1 which are the industry standard polyurethane sealants for use with stucco & masonry structures.


Now, water-proofing is not just about sealants. Flashing is another integral part of properly sealing a structure against the elements.

From our experience, we have concluded that the majority of stucco homes in Houston, Texas have been constructed with incorrect flashing practices by even the most reputable builders out in the market. Some wrong doing with flashings include:

  • Allowing for the roofing shingles to be in direct contact with a stucco substrate.
  • When water cascades down the shingles against the vertical stucco plane, the stucco will wick up the water which can ultimately destroy the underlying wood surface. This is the same situation when it comes to stucco being in direct contact with the floor (also shown below).
  • It is required, by codes in Texas, to allow for a clearance between the stucco substrate and the termination (paved surface or roof line). This also requires a correct ventilation to allow for capillary drainage of water.
  • Window Flashings are another cause for leaks in Houston. The underlayment under stucco need to be properly woven in to control the path of moisture that stucco essentially absorbs. This means that the flashings around windows and doors, need to be properly installed to divert the moisture away from the walls. Many installers do not understand the importance of this before the stucco is applied.
  • Typically, with new flashing installation, the old stucco surface must be removed and new weep-screed or kick-out/diverter flashing should be inserted. New stucco is then applied to the area to protected from future damage.

Many homes are constructed without the benefit of any flashing at converging roof lines, balconies, or chimneys. The lack of proper flashing can produce costly repairs if not corrected quickly.

Interested in our services?

Get in touch with us