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Roof windows and skylights are extremely useful and valuable accessories for the roofs.
Though, a lot of people – and with good – reason are very reserved with their use due to occasional leaks.
It’s true that when you break the continuity of one surface exposed to weathering, various problems with waterproofing might happen.
If, however, you use the right product plus the right craftsmanship problems can well be minimized, even eliminated.
So why roof windows and skylights leak?
1) First thing, check the possibility of condensation. Condensation is a very common phenomenon usually taking place on thermal bridges.
The phenomenon is more pronounced when:
– External temperatures are low.
– Internal humidity is high.
– There is a lack of ventilation and heating.
– There is presence of ice dams.
– Cold rain comes in touch with the window pane.
Of course, as expected, the majority of these problems occur in kitchens and bathrooms.
If the problem is irrelevant to precipitations, it is most probably condensation.
2) On the contrary, if the problem follows a precipitation, there is somewhere a break in continuity. In this case:
2.1) Check if the pane fits absolutely in the sash.
2.2) Check the installation of the proprietary metal flashings.
2.3) Check the application of self adhesive base and cap flashings.
2.4) Check for accumulation of dirt, leaves, dust etc. round the curb.
2.5) Check all exposed nails.
2.6) Check for cracks or fractures on curbs.
2.7) Check eventual sealants compounds: Has the right product been used? How about application?
2.8) Check eventual flanges and their fitting to shingles. Waterproofing with an appropriate sealant may be needed.
2.9) Inspect all flashings in proximity to the skylights or roof windows.
The very fact: Skylights and roof windows will fail if not installed and maintained properly. Choose wisely the product and the contractor and pay attention to the proper maintainance.
Chris Strogilis
http://maconwaterproofing.blogspot.com
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