How to Add a Pitched Roof to a Flat Garage How to Add a Pitched Roof to a Flat Garage

What You'll Need
Three different sizes of lumber: 2-by-12, 2-by-10 and 2-by-6
Plywood (Exterior grade)
Polyethylene sheeting
30 pounds of underlayment roofing felt
Roof shingles

A flat roof garage can be afflicted by certain problem as compared to a pitched roof garage. If the area is exposed to heavy rain falls and less sun light due to dense tree shade, problems such as leaks, rots and boing can be worrisome. These problems don’t just affect the garage structure but are at times also responsible for destroying the things inside the garage. Such problems can be eliminated if a pitched roof is added to a flat garage.

Step 1: Sketching the Idea

You have many alternatives to choose from. Sketch the idea on a piece of paper to late use it for reference. Amongst the choice, you can opt to have a gable roof. These are of the shape of an inverted ‘V’ and have two planes of an equal size. Similar to a gable roof, is a hip roof. Here the inverted V planes are on the smaller end rather than the orthodox long side ends. You can also choose to make a different slop on each face. The easiest amongst different types of pitched roofs is a shed roof. These are featured with a slope following a unitary pattern only.

When adding the pitched roof yourself, a shed rood is most recommended since it’s not only easy to install but also cost effective.

Once you have made the decision of which rooftop to install, you can move to step 2.

Note: Different rooftops will only have slightly different procedures to be followed but the basics still remain the same.

Step 2: Removing the Previous Roof Top.

You now need to remove the flat roof top so as to install the new one. Check to see if the roof structure has undergone any damage due to rain. If so, you would have to replace the previous sheathings or joints.

Step 3: Adding Rafters

At the top of the roof, hold the boards which are braced rigged to add rafters. You would have to make a birds-mouth cut (in line with the desired pitch i.e. angle) of the roof so that the horizontal wood on the wall’s beam and top plates are not disturbed. A birds-mouth is basically when wood is cut in an angle so that it fits together firmly with the other wood pieces already in place. The rest of the rafters also need to be placed 16’’ on center.

Step 4: Sheathing the Roof Framing

Using exterior grade plywood, along with the polythene sheets, the roof framing need to be sheathed.

Step 5: Applying the Underlayment Roofing Felt

The underlayment now needs to be installed along with the roof shingles. The structure needs to be flashed at every place where the planes intersect as well as where there is a door or window opening. You also need to flash the soffit and the fascia, i.e. the underside of the construction unit, and the horizontal surface on which the new roof rests.

There you have it; the pitched roof has been successfully added. The rain water will not store on the roof top anymore.


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