What is the procedure to convert a residential shingle roof to a metal roof?
- Remove trim and ridge vents
- Install a “hat” section directly through the tertiary roof panels and secondary perlins
- Install new roof panels over the existing roof panels
- Install trim
The manufacturer guarantees the system against leaks and the installer backs it up for a period of three years. The wind lift will meet code and original building specifications. A retrofit job can be completed at the rate of approximately 1,500 square feet per day.
To what type of building can the retrofit procedure be applied?
The best candidate is a standard metal building with primary steel, which consists of heavy gauge column beams and steel beam rafters. The secondary steel consists of 14-gauge wall girts and roof perlins with standard “C” girts on the eaves. The tertiary steel consists of 26-gauge wall panels and standard “R” panels” for roof sheets. In the process, “existing K-13″ insulation in the building does not have to be removed. In addition, the underside of some roofs is a 2″ “VRP” insulation installed at the time of fabrication of the building. This also does not have to be removed or changed for a retrofit project; however, insulation may be added between the existing roof panels and the new roof to increase energy efficiency.
How does a retrofit reduce costs?
- It requires no demolition of interior “K-13” and “VRP” insulation and roof panels
- There is no additional interior work
- It eliminates the removal of the mastic on thousands of screws
- There is no risk of widespread corrosion and having to replace the roof, or at least a portion of the roof
How can I tell if I should consider a retrofit?
If your steel building roof has been repaired over the years – maybe even several times – it is a great candidate for a retrofit project. Here are some examples of prior work:
- A layer of mastic
- A layer of fiberglass mesh
- A third layer of mastic
- A final coat of the sprayed finish coat aluminum mastic