Case Studies and Galleries

Scale changes the engineering and the calendar changes everything else. Very large roof areas need drainage and expansion capacity that smaller buildings never require, and the structures move enough that details have to accommodate it. The harder constraint is usually access: a venue with a fixed event schedule gives you defined windows to be on the roof and no flexibility when weather takes one away. Sequencing and the ability to close in work quickly matter more than raw crew size.

Because what is underneath cannot get wet and cannot tolerate humidity swings. Collection storage and gallery spaces are climate controlled to tight tolerances, which puts more weight on the vapor and air control layers than on a typical commercial building, and it makes any leak a conservation problem rather than a maintenance one. Architecturally ambitious museum buildings also tend to have complex geometry, which multiplies the number of transitions and penetrations that have to be detailed individually.

It means work was added after the original contract, which on a complex building is normal rather than a sign of trouble. Conditions get discovered, designs get resolved late, and adjacent scopes turn out to need a single responsible party. The Perot Museum project began as roofing and roof related sheet metal and grew to include the entry plaza and rear entrance. What makes expansion work well is that responsibility for the waterproofing stays with one contractor across the transitions.

It means the roofing contractor is brought in during design rather than after drawings are complete, to review details, flag conflicts between trades, and advise on sequencing and materials. On an unusual building this is where most of the value is created, because a transition that cannot be built is far cheaper to fix on paper. It also sets realistic expectations about schedule before those become contractual.

They tell you about capability and about detailing discipline, which transfer. They do not tell you about responsiveness on a small job, which is a different question worth asking directly. The most useful thing to take from a project list is whether it contains buildings that resemble yours in system type and complexity rather than in fame. Our commercial roofing page covers how projects of any size are scoped.