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augie72

12:01PM | 01/24/04
Member Since: 01/18/04
2 lifetime posts
Bvbasement
the roof on my 12 year old ranch has had mold and moss growing on the outside for years. I just went up today, and found frost on the nails that stick through the plywood, also the high part of the roof was quite wet (dripping) frost was also on all the plywood, also mold...this is all on the north side of the house. south side looks brand new....I have a roof vent as well as sofit vents all the way around....the attic floor is well insulated....help!

Piffin

02:44PM | 01/25/04
Member Since: 11/06/02
1281 lifetime posts
The problem is caused by interior house moisture condensing on the cooler surface of the north facing sheathing.

You need to do one or a combination of three things.

A- Ventilate the attic space so it is cool and so moisture can exit the house, You might have ventilation that is not adequate, You should have one sq ft of vent for eery hundred to hundred and fifty feet of living space, asa general rule of thumb, and it should be vented from eave to ridge. Only one or the other does not work.

b - You need to have a vapour barrier to stop moisture from migrating from living space to the attic and keep the hatch closed and sealed too. The VB is normally installed during construction. There are VB paints you can apply to ceilings but they have marginal effectiveness.

C - You should reduce the interior humidity to around 20% if you can stand it that dry. people are more comfortable at 40% but houses are not.

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