Archives: FAQs

<p>FAQs news and reviews</p>

How do the costs of both new and retrofit low slope GALVALUME standing seam roofs compare with traditional flat nonmetallic roofs?

The many benefits offered by new and retrofit GALVALUME standing seam roofs (SSR) over traditional nonmetallic roofs translate into both direct and indirect cost savings. A retrofit GALVALUME SSR installed on a lightweight structural system over an old, leaking nonmetallic roof is a lower cost long-term alternative and, in many cases, a lower initial cost How do the costs of both new and retrofit low slope GALVALUME standing seam roofs compare with traditional flat nonmetallic roofs?

Where can I buy a GALVALUME roof and how can I get a list of GALVALUME roof suppliers for my area?

The best way to buy a GALVALUME steel roof is through the roof panel manufacturers. The major manufacturers have regional sales offices and manufacturing plants throughout North America. They also have qualified and affiliated contractors who are trained and approved to install their roof systems. It’s important that only experienced and approved contractors be used Where can I buy a GALVALUME roof and how can I get a list of GALVALUME roof suppliers for my area?

Can pressure-treated wood be used in contact with bare and prepainted GALVALUME sheet?

Contact with pressure-treated wood or, for that matter, any wet lumber is not recommended for either bare or prepainted GALVALUME sheet. Treated lumber contains chemicals that protect the wood when buried in soil. Direct contact between wet treated lumber and GALVALUME sheet creates a corrosion cell and the corrosive chemicals leaching out from the wood Can pressure-treated wood be used in contact with bare and prepainted GALVALUME sheet?

What is the life of a prepainted GALVALUME roof or wall?

From a practical standpoint, the life of a prepainted GALVALUME panel is dictated by the performance of the paint film, i.e., appearance as affected by conditions of fade, chalk and peel, and the life of the paint film is determined by the type of paint system and the weathering conditions to which it is exposed. What is the life of a prepainted GALVALUME roof or wall?

Can I place bare or prepainted GALVALUME sheet in contact with the concrete foundation footer?

Direct contact with the concrete footer is not recommended for either bare or prepainted GALVALUME sheet. Water can accumulate at the crevice between the GALVALUME panel and the footer, causing corrosion at the cut edge. Ideally, sill plates should be used on concrete foundations to avoid direct contact with the foundation and to drain water Can I place bare or prepainted GALVALUME sheet in contact with the concrete foundation footer?

GALVALUME sheet can be attacked by concrete and mortar. How are such attacked areas on GALVALUME roofing and siding best repaired?

The aluminum-zinc coating on GALVALUME sheet suffers fairly rapid corrosion in highly alkaline environments, such as concrete. The coating is attacked during the setting period when buried in concrete and can also be attacked from mortar splashes and droppings during masonry installation. The best repair for attack from mortar splashing is to cover the affected GALVALUME sheet can be attacked by concrete and mortar. How are such attacked areas on GALVALUME roofing and siding best repaired?

What is the difference between GALVALUME roof systems that use concealed and exposed fasteners?

There are several variations of concealed fastener systems. For low slope structural systems, panels are overlapped and lockformed or snapped together at the seams and held down with clips, one end of which is overlapped in the seam and the other end fastened to the structural member of the roof. The clips have a sliding What is the difference between GALVALUME roof systems that use concealed and exposed fasteners?

What types of flashing are recommended for bare and/or painted roofs?

Because GALVALUME sheet does provide long life, flashing should be used that will provide a life commensurate with that of GALVALUME sheet. For bare GALVALUME sheet roofs, GALVALUME sheet flashing is preferred, although aluminum flashing is also acceptable. Galvanized flashing is not recommended because it will not provide comparable corrosion resistance. Copper and lead are What types of flashing are recommended for bare and/or painted roofs?

What types of insulation are recommended for GALVALUME roofs? Are there any to be avoided?

By far, fiberglass roll insulation is the most commonly used insulation for GALVALUME steel roofs on nonresidential buildings. It can be used in any of the available thicknesses to give the required insulation value. One of the main benefits of retrofitted GALVALUME roofs installed over leaking nonmetallic flat roofs is the ability to add insulation What types of insulation are recommended for GALVALUME roofs? Are there any to be avoided?

Should architectural GALVALUME sheet roofs be installed on decking or over shingles on residential applications?

Wood or steel decking is normally used for prepainted GALVALUME architectural roof systems on both residential and nonresidential applications, but it is not recommended to install the panels in direct contact with the decking. Instead, 30 pound felt, or an equivalent, should first be installed on the decking and the roof panels then installed over Should architectural GALVALUME sheet roofs be installed on decking or over shingles on residential applications?