Asbestos Siding 1950

It is sometimes referred to as asbestos insulating board.

Asbestos siding 1950.

Given the scarcity of old growth wood sourcing lumber of the same cut and quality as the clapboards on an 18th century dwelling can be an exercise in frustration. Because fiber cement siding manufactured in north america after around 1978 was made without using asbestos in those later products and because those non asbestos fiber cement shingles included products that by eye were an exact visual match for their older asbestos containing brothers and sisters already installed a building built before 1978 and sided with cementious shingles. Asbestos ranks high on the list of dangerous substances because of its toxic and carcinogenic properties when airborne. Asbestos shingles are relatively strong but brittle.

China glaze was a trademarked name for a cement asbestos siding shingle filed by u s. Homes built between 1920 and the 1960s are likely to contain asbestos in any cementitious siding tiles. Ldb was manufactured from the 1950s to the 1970s as a flat sheet or perforated sheeting product typically used for acoustic ceiling applications. Although asbestos was commonly used in exterior siding from the 1930s to the 1970s it was mixed with asphalt and cement not wood.

Ldb can contain up to 70 per cent asbestos fibres by volume. Lead paint wasn t outlawed until 1978 so it s sure to be present on siding going back to the 1950s. Covering old asbestos shingles with new siding may seem like an option too but it s not easy to do safely. These materials are known as fiber cement siding and they contain no asbestos.

If you suspect that your siding may contain asbestos there is no need for alarm. Bonded asbestos products the vast majority of asbestos containing products used in houses were bonded asbestos cement materials including. Let the siding dry then prime and paint with the best exterior latex you can find. The harmful effects of asbestos were beginning to be acknowledged and the introduction of asphalt based roofing products began dominating in the late 1950s.

Sometimes finding a match for original siding is easier said than done. Asbestos cement sheeting typically contains between five to 20 per cent asbestos. Gypsum and trademarked in 1962. While older homes will likely contain asbestos in roofing insulation and tiles it can also be present in exterior siding.

Finally in 1989 asbestos became illegal when the environmental protection agency epa issued an asbestos ban and phase out rule. Cementitious siding installed after 1973 is very unlikely to contain asbestos. Those deteriorating shingles could come down.