The repair library

Good repairs start
with good information.

Find practical guidance by roof material, leak location, or repair detail.

Flashing & transitions

Metal Roof Edging: Finding Leaks at the Perimeter

A loose roof edge can let water run behind the gutter or beneath the membrane. Follow the edge detail from the roof surface to the…

Read the guide

Flashing & transitions

Leaks Where Shingles Meet a Low-Slope Roof

The transition between a shingle roof and a low-slope membrane must direct water onto the lower roof. Water can travel beneath the shingles or through…

Read the guide

Flashing & transitions

Roof Valley Flashing: Following the Water onto a Flat Roof

A valley collects water from two roof slopes and concentrates it at the outlet. If that flow reaches a low-slope roof, both the valley and…

Read the guide

Flashing & transitions

Leaks Around Roof Posts and Railings

Posts and railings penetrate or interrupt the roof's weather barrier. A patch around a moving or poorly supported post may fail again, so the attachment…

Read the guide

Flashing & transitions

Cupolas on Flat Roofs: Curb and Wall Connections

A cupola creates a roof-to-wall transition that must shed water continuously around its base. Inspect the curb flashing and the cupola's own walls or vents…

Read the guide

Flashing & transitions

Pitch Pocket Leaks: What to Inspect Around Pipes and Cables

A pitch pocket is a flanged enclosure around roof penetrations such as pipes and cables. A hollow, cracked, or separated filling can allow water to…

Read the guide

Flashing & transitions

Roof Flashing Leaks: Why Transitions Need Close Inspection

Flashing connects the roof covering to walls, penetrations, edges, and other materials. A small opening at one of these connections can cause a significant interior…

Read the guide

Flashing & transitions

Brownstone Roof Case Study: Parapets, Chimneys, and Flashing

Closely spaced walls and roof penetrations create many transitions on a brownstone roof. This archive case highlights the need to inspect each connection and avoid…

Read the guide

Flashing & transitions

Rooftop A/C Curbs: Plan the Opening and the Flashing Together

An equipment curb interrupts the roof assembly. Its support, opening, flashing, and service connections must work together; adding surface sealant cannot correct an unsupported or…

Read the guide

Flashing & transitions

Garage Roof Details: Siding, Posts, and Door Thresholds

A small garage roof can have complex connections to siding, posts, doors, and adjoining walls. These details often deserve more attention than the open area…

Read the guide

Good repairs startwith good information.

Good repairs start
with good information.