Damaged precast sill joints in Vaughan can allow water to enter beside or beneath an exterior window sill. These joints often occur where individual sill sections meet or where the sill ends against another material.
The sill may remain solid while the connecting joints deteriorate. Therefore, inspecting only the centre of the sill can miss an important moisture path.
Why Do Sill Joints Separate?
Precast concrete and surrounding masonry respond differently to temperature and moisture. Small amounts of movement can place stress on rigid joints.
Water may also enter an existing hairline opening. During freezing weather, the moisture expands and can widen the joint.
Previous repairs sometimes contribute to failure. A hard mortar patch or surface smear may crack when the sill moves again.
Mortar or Sealant?
The correct joint material depends on the sill design and location. Some joints form part of the masonry assembly and require compatible mortar. Others need a flexible exterior sealant that can accommodate movement.
Using sealant in every joint is not automatically correct. Likewise, packing a movement joint with rigid mortar can cause repeated cracking.
A masonry contractor should determine the joint’s purpose before selecting the repair material.
Repairing Precast Sill Joints in Vaughan
Failed material must be removed carefully. The repair surface should be clean, stable, and properly prepared before new mortar or sealant is installed.
The sill’s slope and drip detail should also be inspected. Repairing the end joints will not solve water problems if the sill directs rain toward the window.
BAKR Masonry provides professional window sill repair in Vaughan. We examine the sill, joints, surrounding bricks, mortar, and visible water path.
Check the Entire Window Opening
Cracked bricks, failed sealant, damaged flashing, or movement above the window can create similar symptoms. Interior stains do not always identify the exact entry point.
Structural changes to a window opening may require a permit. The City of Vaughan provides specific information for residential building permits and window openings.
BAKR Masonry brings decades of masonry experience to residential and commercial properties. We maintain WSIB coverage and liability insurance.
Contact us at 437-727-4797 or info@bakrmasonry.com.
