Roof Installation in Burlington County, New Jersey

Planning the assembly before anything goes on

A roof is a stack of components that each have to work with the ones above and below: deck, water barrier, underlayment, metal, covering, ventilation. On a new installation, decisions at the bottom of that stack constrain everything above it, so they are worth making on paper.

Slope is the first constraint. Anything below the minimum pitch for shingles needs a membrane system rather than a shingle one, and a shallow porch or a low addition roof frequently falls into that category even when the main house is steep.

• Pitch, and whether it supports the intended covering
• How the new roof drains, and where that water goes
• How the new plane ties into the existing roof and walls
• Where intake and exhaust ventilation will come from

Tying new work into an existing roof

The junction between new and existing work is the most failure-prone part of any addition. A new roof plane meeting an old wall needs step flashing woven into the courses and counter-flashing or a properly detailed siding return above it. A new valley formed where an addition meets the main roof carries concentrated runoff from the first storm onwards.

There is also a practical question of matching. Shingles weather, so a new section will not match an existing roof exactly even in the same product and colour. It is better to decide deliberately — match as closely as possible, or treat the new roof as its own plane — than to discover the difference after installation.

Decking and structure

New decking should be the correct thickness for the rafter or truss spacing, fastened to pattern, and laid with the required gapping so the sheet can move with humidity without buckling. Where a deck has been framed by others, it is checked before anything covers it, because once the underlayment is down nobody sees it again.

Anything structural — undersized framing, an unsupported ridge, a rafter tie that has been cut — belongs to a carpenter or an engineer rather than a roofer, and it is better raised before the roof goes on than after.

Ventilation on a new roof

Ventilation is far easier to get right at installation than to retrofit. A new attic or roof cavity needs a clear path from intake at the eaves to exhaust near the ridge, sized to the space it serves, and that path needs to survive the insulation being installed.

Small additions cause the most trouble, because a short roof plane over a narrow cavity often ends up with intake blocked by insulation and no exhaust at all. Planning it as part of the installation avoids a sealed pocket that collects moisture every winter.