Fixing Our Old House

Fixing metal roof
Fix wood rot
Painting siding
Fixing metal roof
Fixing wood damage
Installing gutters

White Roof Cooler

Because we have a flat roof, the roof that was over half of our house was painted white. This was done to lower the summer temperature in the rooms below. It made a big difference.

On a 83 degree day, our black metal roof registered 153 F while the white roof only measured 108 F. Cool roof information.

Click to enlarge
Metal roof at the start
A. The rusted roof
Metal roof at the start
B. A scraped area
Metal roof at the start
C. Primed
Metal roof finished

D. Area to cover with one roller full of coating

Rust Conversion

If there is rust on your roof, using a rust converter (rust reformer) will assure that your rust will be locked in. Rust reformer is a synthetic polymeric formula that converts existing rust into a moisture free, black protective coating. Not only does it eliminate existing rust, but it seals out moisture to prevent the possibility of future rust formation and corrosion.

Preservation Products recommends SKYCO OSPHO.

Painting a Metal Roof


Our metal roof is made of terne metal. It had been painted over the years with a regular roof paint. Where the metal seams had bent, the paint collected as hard blocks. As you can see from Photo A, the paint had peeled off and the roof rusted. An examination showed that the metal was solid with a few small holes.

The first job was to scrape all of the loose rust, dried paint chunks, and old roof cement. The roof was power washed and a metal putty knife was used to scrape the rust and old paint. Although it isn't recommended to use a metal implement to scrape the roof, it was the only way to remove the loose rust and old paint. You have to be extremely careful not to pierce the metal. Photo B shows an area that has been scraped. During the scraping, straighten up any bent seams.

After the scraping, the roof was power washed using a house wash. If you have moss or algae wash with a chlorine solution.

In Photo C, you can see the two right panels that have been treated with the OSPO metal treatment. The panels on the left have had the OSPO treated areas primed with Preservation Products rust inhibative base coating.

Because the old gutter supports were nailed through the roof, I removed the roof cement they were covered with and then covered them using Preservation Product's Reinforced Restoration System.

If you find any holes or weak areas, use Preservation Product's fiberglass mesh to strengthen them. See Patching a metal roof.


Metal roofs should be coated (painted) with a specially roof formulated acrylic latex which bonds tightly to metal and becomes a flexible coating 15-20 mils thick. I used Acrymax from Preservation Products.

I used three coats. The first was their basic coating (HP-1000) followed by two coats of HP-5000. These coatings have to be "slathered on" to reach the coverage rate of one gallon per 100 sq. ft. This rate was almost impossible to reach using a 3/4 inch roller.

Preservation Products offers a good description of the advantages of these acrylic roof coatings for metal roofs.

Product information

Preservation Products - More informationleave site

Rust Converters

SKYCO OSPHO leave site










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