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nails or screws ?

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Guest User
1/2/2006
I have talked to two different companies, one uses nails and the other uses screws. The one that uses screws has a rubber washer around it, how long do they last. Which one do you think is the best. They both don't put underlay down, saying that because they cross strap, there will be no condensation concerns, your thoughts on that . This roof will be going on our house over three tab shingles.
Allan Reid
Dura-Loc Roofing Systems, Inc.
1/3/2006
The fastener depends on the type of product, the application and the testing. From my companies experience, nails tend to work loose in our environment as the wood expands and contracts with the hunmidity/ heat and cold. Also nails do not work well in wind uplift conditions. As to the underlayment, it is required by tyhe code however if the existing asphaltt shingles are in good enough condition it will work as the underlayment. As to condensation, all rrofing materials for condensation, however with metal it transmits the heat faster so you could have more dew point crosings depending on the colour. Certainly check out the ventilation and make sure the attic complies. If you have a vaulted ceiling you must supply 1.5" of vertical vented free air. Regardless I would recommend ventilating the iar space under the metal as it will lower your rnergy costs.
Guest User
1/3/2006
Thank you for the information. It has helped me pick the company to use plus a few questions to ask before they start.
Allan Reid
Dura-Loc Roofing Systems, Inc.
1/4/2006
Don't forget to ask for referances on similar type jobs and then go check them out. Good Luck.
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