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Old 01-06-2009, 03:07 PM   #1
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Damp Roof Trusses


To my horror I discovered a lot of condensation in my attic last weekend, the timber in the roof trusses seem to be soakin up moisture from condensation on the back of the roof felt. I have recently installed a gas fire with a strong output and uPvc windows which are both probably adding to the problem. I plan to add extra ventilation but need advice - at present only have soffit vents - these I need to check as I got them covered a year ago with plastic maintenance-free ones by a contractor. As my house has gable walls to front and back I plan to add exhaust vents, one on each end at high level but wonder if I should add smaller vents at floor level of attic or just ensure the vents in soffits are ok. Also once I have all the timber dried out, can I treat it with some type of preservative.

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Old 01-06-2009, 03:46 PM   #2
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Damp Roof Trusses


Hard to give a detailed answer without more info.

Try this link for attic ventilation info.

http://roofingcontractorreview.com/R...ntilation.html

Definately check the soffits for blockage. Continuous soffit vents around the perimeter of the house are best.

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Old 01-06-2009, 04:07 PM   #3
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Damp Roof Trusses


Thanks old timer only problem is I don't have any ridge vents at all - so if I check my soffit vents and add exhaust vents on gable ends will I likely get a flow of air through the attic
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Old 01-06-2009, 04:19 PM   #4
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Damp Roof Trusses


You must have gable end vents or ridge vents to exhaust the air containing the moisture. If you only have soffit vents then you have intake , so to speak and no exhaust.
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Old 01-06-2009, 04:43 PM   #5
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Damp Roof Trusses


I live in a large housing estate and half of the houses are just like mine - the ridge tiles are all cemented down with no gaps or vents ( the roof felt is continuous inside the attic ) and there are no openings / vents on either gable end
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Old 01-06-2009, 06:32 PM   #6
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Damp Roof Trusses


Soffit vents alone will act as both intake and exhaust. But will not be as efficient as soffit vents with gable vents and or ridge vents.

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so if I check my soffit vents and add exhaust vents on gable ends will I likely get a flow of air through the attic
Yes

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