Zinc Flat Roof Construction

Zinc roofs can be laid to very low pitches down to 3º depending on the type of jointing seam used.

Zinc flat roof construction.

Perhaps zinc s best known benefit is its ability to keep away corrosion. Sheets of zinc are placed over the flat surface and strips of zinc are placed over the battens to replicate the effect of upfolds and crimping in standard seam zinc roofing. Zinc can also be laid over insulation boards on top of an existing felt roof. There are several methods and materials for the design of the exterior surface of a warm or cold flat roof.

By the end of the 18th century europeans had begun smelting zinc and the process spread to the u s. It plays a significant role in ensuring steel doesn t prematurely rust. A special vented plastic grid is laid below the zinc. Durability and corrosion resistance.

Ft or 450 to 800 per square. In the european roofing market 70 of all residential roofs utilize zinc. The risk of this happening is increased if you ve chosen to use a warm roof construction. For that reason cold flat roof construction needs to keep in mind the need for unblocked airflow.

Warm zinc roof construction can also use timber substrates but the need to reduce cold bridging in many countries has led to the use of rigid insulation boards and composite insulation boards or sandwich panels as the direct substrate under the zinc. Standing seam warm roof on rigid insulation. Zinc has been used on roofs for over 150 years. Hot tar and gravel.

The 3 most common materials used for flat roof construction. Flat roofs are hard to replace. In the construction world in particular it is is most commonly used for roofing and zinc panels. Some observers suggest it s harder to replace a flat roof than a traditional pitched shingle roof because of the labor required to remove its layers especially on older flat roofs.

The breakdown for material costs is as follows. Zinc has a lower melting point than other roofing metals. By the mid 19th century. The material costs for zinc roofing range between 4 50 and 8 per sq.

Made to last for generations little to no maintenance durable sustainable. Standing seam g3. Standing seam warm roof on insulated metal faced panels. Standing seam cold roof on open gap timber boarding.

But now flat roofs often are constructed with fewer layers because of improved waterproofing technology. Standing seam warm roof on plywood bonded to phenolic foam. For heritage or flat roof projects a batten roll method where generally wooden battens are fixed to the plywood or timber roof substrate to form ridges is a good alternative. For decades it has been the preferred choice for roofs all over the world in the form of architectural zinc rheinzink.

This could mean flat roofs may not raise the same red flags they used to. How much does a zinc roof cost.