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Siding
Mould and
Moldy Siding
[August 18,
2003]
Q.
Once a year at about this time, the house gets a black coating on top
of the paint. The longer it stays the darker it becomes. Have you heard of
this before and if so can you tell me what it is and how to treat it? Once
removed, I would like to vinyl side the house. If I side the house will
the black stuff occur under the siding? Note: We have washed the house down
in the past with a bleach based cleanser. Also, washed house down with a
product recommended by house paint distributor.
A.
mould is eating the siding paint itself and organic dirt that has settled
on the house paint, and is possibly already spread by growth into the wood
itself. To get rid of this mould on siding problem, you will need to: (1)
first spray the moldy siding surfaces with one wet spraying of the mould
fungicide; (2) physically remove the mould growth with such power tools as a
planer, wire brush attachment to a grinder, and sander. If you cannot
remove enough moldy materials to get to original, uncontaminated wood, you
will need to remove and replace the wood siding with outer insulation
sheathing and your desired vinyl siding. Additional steps: and (3) spray
the cleaned wood with one wet coating of Tim-bor antimicrobial protective
coating. Follow the mould remediation steps explained at
Mould Removal
[August 18,
2003]
Q. We had our 25 year old
house painted 3 or 4 years ago by brush and shortly afterwards a black
area appeared on the north side of the house. It looked as though it was
from a person splashing a pail of something against the wood siding. We
didn't do anything to try to address it, but a year later this black
(apparently mould) started to spread and now covers much of the house's
exterior. We can remove it temporarily with a 1 part to 3 bleach/water
spray mixture, but it returns after a couple of months (or less this time
of year). Last year we put on new plastic eaves and downspouts and it
quickly spread to those.
A. Do not use ineffective
bleach. Instead use EPA-registered mould fungicide. You also need to checking into the wood
siding to see if exterior house mould growth has penetrated inward, in
which case you would have to physically remove such mould penetration
with power planer, power grinder with wire brush attachment, and power
sander. Follow the steps explained at Mould
Removal If there has been no
exterior home mould growth into the wood, after killing the mould, clean
the siding with a solution of 2 cups of Borax laundry detergent per
gallon of distilled water. Then seal the exterior of the siding against
moisture with a clear plastic coating available from your paint dealer.
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