How Far Should The Roof Sheathing Overhang Fascia Be?

How Far Should The Roof Sheathing Overhang Fascia Be?

How Far Should The Roof Sheathing Overhang Fascia Be?

The optimal installation approach is to leave a finger-width space between the drip edge and the fascia board. The shingles should also extend 3⁄8 to 1/2 inch over the drip border.

The fascia will keep the moisture out of the airspace, and the shingles will help direct water to the main body of the shingles.

What Type Of Plywood Is Used For Roof Sheathing?

In roofing construction, two types of plywood are used: structural plywood and ordinary plywood. Structural plywood has strong performance supplied by the supplier, indicating that it has met the building standards for structural usage in a structure.

It is also identified by an identifying brand mark on the surface of the plywood. Structural plywood has a waterproof core of cellulose and meets the requirements of ASTM C1130. Structural plywood is used for girts, truss chord members, and top and bottom chords.

Ordinary laminated exterior-type plywood with a waterproof surface is used for sheathing between rafters or trusses. It can be used as gifts, side-rafter or end-rafter butt members (sister-rafters), fascia or soffit boards, subfascial, ridge boards, and diagonal struts.

Does Roof Sheathing Need Galvanized Nails?

Use nails made of hot-dipped galvanized steel for optimum performance from your fastening. Use at least 12-gauge or larger wire.

The length of the nail required will be determined by the thickness of the sheathing and shingles, the number of fasteners per sheet, and the spacing factor.

The preferred way to attach plywood to the framing members is to use common nails. See the table below for the required fastener schedule.

Coarse-Thread, Hot-Dipped Galvanized Steel Nail (12-Gauge Or Larger)

Common nails are made from carbon steel, with a coating of Zinc on them. Galvanized nails contain about 97% Zinc and have a bright zinc plating that protects against rusting.

The advantages of this fastener are resistance to rusting, less maintenance than wire nails, and longer life.

How Do I Know If My Roof Sheathing Is Bad?

There are various ways of knowing if the roof sheathing is bad;

The age of your house and roof, The quality of your most recent roof installation,The number of roof leaks, Roof pitch/slope, Ventilation on the roof, In the attic, there is wood decay, and The state of your fascia, soffits, and siding. 

1. The age of your house and roof.

The longer your roof has been exposed to water, the more damage it has sustained. This means that your roof sheathing is more likely to have rot and grow mold and mildew.

2. The quality of your most recent roof installation.

Roofs and sheathing must be properly installed to ensure the safety of everyone in the house. This means you should not hire a non-professional installer if you want a job done right the first time.

Just because a company is willing to install your shingles at a cheap price does not necessarily mean they will use high-quality materials on your house.

Always check the quality of their products, equipment, and installation techniques before signing a contract with any roofing company

3. The number of roof leaks.

Roof sheathing can rot, crack, and break due to the effects of rainwater, severe storms, and heat. Rotting and cracking can lead to water leakage inside your house.

4. Roof pitch/slope.

The faster your roof pitches, the less time water has to sit on top of it. This is why roofs with a high pitch tend to last longer than those with a low pitch/slope.

5. Ventilation on the roof.

Any space between the roofing material and the roof deck is an area for mold growth. The faster the roof breathes, the more clean air your roof will have to absorb and keep mold growth at bay.

6. In the attic:

The worst place for mold to grow is in an enclosed space that is dark, contaminated, and warm. Mold can quickly spread throughout your house if it gets into your ductwork or plumbing systems.

7. Wood decay (worm damage).

Many homeowners make the mistake of not sealing their crawl space’s wood components to protect it from moisture and insects, such as wood borers and termites. This often results in the rotting of the wood, which will cause your roof sheathing to rot and collapse.

8. The state of your fascia, soffits, and siding.

Filled with wood or plastic that has been damaged by hail or high winds, or has been infested with insects such as termites, then this can cause damage to your roof sheathing

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