Inside a typical roof
What’s under your shingles?
A roof is a system of layers. Knowing which one has failed is the difference between a small repair and a new roof.
- 01
Shingles
The layer you can see. It sheds water and takes the sun, wind and hail. Missing or curling shingles are often the first warning sign.
- 02
Underlayment
A water-resistant sheet beneath the shingles. If water gets past the surface, this is the second line of defence.
- 03
Ice and water barrier
A self-sealing membrane often used at eaves, valleys and around chimneys and vents, where leaks most often begin.
- 04
Roof deck
The boards everything is fastened to. Soft or rotten decking is a common reason a small leak becomes a bigger job.
Illustrative. Not to scale. Actual roof assemblies vary by material, manufacturer and local building code.
Not sure which layer is the problem?
Request an inspection




