Winterize Your Home: Inside and Out — 2026 Complete Guide
Part 5 of 22 in Winterize Your Home: Inside and Out. By Damon Fowler, Trends Kitchen & Bathroom Specialists.
A tube of sealant is useful only when it goes in the right joint. Exterior walls are designed to manage water, and some openings allow that water to drain. Covering every visible gap can trap moisture rather than keep it out.
Identify the joint before choosing the product
Inspect accessible window and door trim, utility penetrations, siding transitions, and previously sealed joints. Look for sealant that has pulled away, split, become brittle, or lost adhesion. Note whether the material beneath it is firm and dry or soft and stained.
Check the window or siding manufacturer’s details where available. Weep openings, drainage slots, and required ventilation spaces need to remain functional. A gap at a designed drainage point and a failed perimeter joint may look similar to someone unfamiliar with the assembly.
Situation: caulk keeps cracking at the same window
Imagine a joint that has been covered with new caulk every fall. The surrounding trim is soft at the bottom, and the replacement material separates again by spring. The issue may involve wet or deteriorated substrate, joint movement, poor preparation, or an unsuitable sealant.
Adding another bead over the old material does not investigate those causes. Have damaged trim and the water-entry path evaluated. The repair may require removing failed material, correcting flashing or drainage, replacing deteriorated components, and then sealing the intended joint.
Prepare the surface rather than decorating the defect
For a sound joint suitable for homeowner maintenance, remove failed sealant as directed without damaging adjacent surfaces. Clean and dry the joint, observe application-temperature and weather restrictions, and use a product compatible with both materials. Some joints need backer material or a specific geometry for the sealant to move correctly.
Read the label for paintability, adhesion, cure conditions, and exposure. A bathroom sealant is not automatically the right exterior product. Paint can fail over a sealant that is not designed to accept it, and a product applied to a wet or freezing surface may not perform as expected.
Penetrations deserve more than a ring of foam
Where pipes, cables, vents, or conduits pass through the wall, assess both weather protection and the opening’s purpose. Combustion vents, hot components, electrical equipment, and fire-resistance requirements need appropriate materials and clearances. General-purpose expanding foam is not a universal repair.
If the opening serves an appliance or contains damaged wiring, leave its repair to the appropriate professional. Do not seal a required air inlet because it feels drafty.
Check what is touching the wall
Vegetation, stored materials, and piled mulch can hide deterioration and hold moisture against finishes. Improve access for inspection and keep required clearances intact. Photograph suspect areas before cleaning them so the original pattern remains documented.
The goal is a wall that sheds and drains water as designed while limiting unintended air leakage. When the design is unclear, identifying the assembly is the next step—not applying more product.