Framing Gable and Shed Dormers Islip NY

Whenever adding any type of dormer in Islip, it's essential to determine the roof load and design the load path transfer to the existing floor joists or roof rafters. Then you can ensure adequate bearing points, or add framing and install beams to carry the loads through the walls down to the foundation. It wouldn't be a bad idea to consult a structural engineer for guidance, especially on larger dormers.

Local Companies

Incredible Home Improvements, LLC
(516) 608-3375
15 William Street
Amityville, NY
Home Improvement Man Inc
(516) 681-3737
92 Ketchams Road
Hicksville, NY
Di Monda Roofing
(516) 785-0352
2569 Island Channel Rd
Seaford, NY
Timberline Roofing
(631) 427-3000
11 Oriole Pl
Huntington, NY
Roof Leak Repair Long Island
631 393 6813
500 Bi-County Blvd.
Farmingdale, NY
New Roof Long Island
516-986-4156
32 W. Main Street,
Long Island, NY
NEW YORK CITY BEST CONSTRUCTION CORP.
347-26-9950
25 BEECHWOOD PLACE
Massapequa Park, NJ
Done Deal Gutters & Constr
(631) 261-2385
144 Broadway
Greenlawn, NY
John J. Griffin Roofing
(877) 669-6269
619 Sunrise Hwy
West Babylon, NY
Tipperary Construction
(516) 679-2215
2567 Mermaid Ave
Wantagh, NY
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Source: TOOLS OF THE TRADE Magazine
Publication date: July 11, 2006

By TOOLS OF THE TRADE Editors

Whenever adding any type of dormer, it's essential to determine the roof load and design the load path transfer to the existing floor joists or roof rafters. Then you can ensure adequate bearing points, or add framing and install beams to carry the loads through the walls down to the foundation. It wouldn't be a bad idea to consult a structural engineer for guidance, especially on larger dormers.

Gable Dormers

Gable dormers get their name from the gable roof covering them. These dormers are built perpendicular to the existing roof plane, with their ridges extending out from the existing roof. This means the sidewalls of the dormer bear and transfer the weight of the dormer rafters to the existing main roof rafters or the existing floor joists in the room/attic below. Which way you decide to support the dormer loads depends on the interior layout you're shooting for.

Bearing on the Rafters. My first choice is to install double or triple roof rafters on either side of the new dormer for the sidewalls to rest on. This eliminates the need to remove attic subflooring to insert additional joists. It also leaves the area beneath the common rafters uncluttered without any walls to interfere with open space and provides freedom to lay out partition walls later.

I locate the position of the dormer and do as much work as possible inside the attic before opening up the roof.

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