Rafters Over Existing Roof

Some roofers install a layer of waterproof shingle underlayment wsu over the existing shingles at the eave end as would be done for a roof laid on bare sheathing.

Rafters over existing roof.

This foam is applied over the top of the membrane that came down from the roof deck catching the wall control layers. There are a few situations where roofing over an existing roof just isn t possible. Standing seam systems can be ordered with a narrower starter panel to offset the new panel from the existing panel module. Place the rafters on 24 centers attach them to the settle joists and beams toward the center.

In any case the structure that the shed roof is leaning on is an existing roof typically a gable roof with a ridge and a steeper slope than that of the shed roof. Make sure to check the vertical beam to ensure that the end rafters are placed securely. Attach the rafters to the house with joist hangers which supported by ledger boards. We re happy to give you a free inspection.

One of the keys to over roofing is to tie the air control layer of the roof assembly to the air control layer of the wall assembly. Attaching near the eaves the. Roofing over your existing roof is not always possible. Premade trusses will form the skeleton of your new roof above your old roof.

Adding a roof over an existing deck should you if you 39 re like most people if you were building a new patio pergola or verandah in winter you would make sure nbsp start with the rafters when adding a roof to your patio or. Attach the rafters to the ledger boards and settle joists. Installing a new roof over an existing one also called a layover or nailover is often possible although not always the best option a properly installed layover roof can look and function as well. The cheapest option would be to leave the old roof in place and place the new rafters over the existing roof.

However installing new flashings including special drip edge flashings made for reroofing will ensure a tight seal and a long life. The process of replacing existing rafters so that your roof remains intact without removing the roof to do it requires some basic carpentry skills and a few common tools. Note the 2 lb ft3 spray polyurethane foam enhancing the air seal around the extended rafters. The only way to know for sure whether it will work for you is to ask a professional roofer.

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