Yes — and it’s an important threshold to understand, especially on homes with low-slope sections like covered porches, additions, or transitions.

Standard asphalt shingle installation requires a minimum pitch of 4/12. Below that, water doesn’t move off the roof surface quickly enough for standard shingles to perform correctly.

At a 3/12 pitch, asphalt shingles can still be installed — but the installation requires modifications. Specifically, a double layer of underlayment or ice and water barrier is required beneath the shingles to compensate for the slower water movement at that pitch. It’s a code and manufacturer requirement, not a suggestion, and it’s how we install every low-slope shingle application.

Below 2/12, standard asphalt shingles are no longer appropriate regardless of underlayment modifications. For those sections we install OmniSeal — a granulated roofing product specifically engineered for very low-slope applications. It provides the waterproofing performance those sections need without requiring a full switch to a different kind of roofing.

If your home has sections at varying pitches — which is common in Montana homes with additions, porches, or complex rooflines — we assess each section individually and specify the right product for each slope. A roof that’s installed correctly across every pitch is a roof that performs correctly everywhere.