Rafters Over Existing Roof

Roofing over your existing roof is not always possible.

Rafters over existing roof.

The cheapest option would be to leave the old roof in place and place the new rafters over the 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. 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. Attaching near the eaves the.

Attach the rafters to the house with joist hangers which supported by ledger boards. However installing new flashings including special drip edge flashings made for reroofing will ensure a tight seal and a long life. Place the rafters on 24 centers attach them to the settle joists and beams toward the center. We re happy to give you a free inspection.

Attach the rafters to the ledger boards and settle joists. Standing seam systems can be ordered with a narrower starter panel to offset the new panel from the existing panel module. 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. Premade trusses will form the skeleton of your new roof above your old roof.

Make sure to check the vertical beam to ensure that the end rafters are placed securely. Use premade roof trusses premade roofing trusses will be easier and take less time than installing a stick built roof. Note the 2 lb ft3 spray polyurethane foam enhancing the air seal around the extended rafters. 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.

This provides added protection against ice dams. 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. The only way to know for sure whether it will work for you is to ask a professional roofer. Over time roof rafters can wear crack or rot and replacements may be in order.

This foam is applied over the top of the membrane that came down from the roof deck catching the wall control layers.