Rafters Over Existing Roof

Roofing over your existing roof is not always possible.

Rafters over existing roof.

The only way to know for sure whether it will work for you is to ask a professional roofer. The cheapest option would be to leave the old roof in place and place the new rafters over the existing roof. Make sure to check the vertical beam to ensure that the end rafters are placed securely. Video of the day volume 0.

However installing new flashings including special drip edge flashings made for reroofing will ensure a tight seal and a long life. Attach the rafters to the house with joist hangers which supported by ledger boards. Standing seam systems can be ordered with a narrower starter panel to offset the new panel from the existing panel module. Attach the rafters to the ledger boards and settle joists.

This provides added protection against ice dams. 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. This foam is applied over the top of the membrane that came down from the roof deck catching the wall control layers.

Over time roof rafters can wear crack or rot and replacements may be in order. There are a few situations where roofing over an existing roof just isn t possible. 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. 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. 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. Premade trusses will form the skeleton of your new roof above your old roof.

Place the rafters on 24 centers attach them to the settle joists and beams toward the center.