What is the lifespan of plywood as roof decking?

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It's a mistake for the roofers to say that the plywood will definitely have to be replaced. However, they may be familiar with homes in your area, that were built around the same time. So they may have experience, that tells them that the decking will likely have to be replaced. Sometimes in situations like this, contractors will pad the estimate with the cost of replacing the decking. When they do the work, if they don't have to replace the decking they'll remove/refund the cost.

All that being said. I don't know these contractors, and have not talked to them. I can't say for sure what their intentions are.

Comparing plywood used as subflooring, to plywood used as roof decking is a mistake. Roof decking bakes in the sun, freezes in the cold, and may be surrounded by moisture laden (potentially salty ocean) air . While the subfloor rests comfortably in conditioned space (typically).

I'd say guaranteeing that the plywood will need to be replaced, is just as...

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Function

Your roof keeps the elements from damaging your home. Rain, snow, ice and wind can destroy your home if it’s not protected by a good roof. How well the roof protects your home and for how long depends on how well it was installed and from which materials. If you want your roof to function properly, use better-quality materials. If you plan on owning a property for only a short time, you might use a lesser-quality material. Many people use a certain material because of its aesthetics; however, that may not be the best material for your particular roof.

Prevention/Solution

To give your roof a longer lifespan, do an inspection at least once a year. If you live in a climate that is particularly cold, snowy or prone to ice, inspect it after the winter is over. If you live in a hot climate, do this after the summer. Check for curled-up edges and missing or worn granulars on asphalt shingles. Look for cracks in any type of shingle. Wood shakes have a...

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Plywood, a product made by gluing a number of thin layers of wood together, is an inexpensive and convenient material often used as a base for other materials. The two most common areas in construction projects where plywood decking is used are roof decks and sub-floor decks. Plywood decking is fastened to roof trusses or floor joists to provide a substrate for other materials like roofing shingles, finished flooring etc.

There are many types of plywood decking. Softwood plywood consists of between three and five layers and is sold in sheets measuring 4 by 8 feet (1.2 by 2.4 m). This type of plywood decking is commonly used for roofing applications at a thickness of 5/8 inch (15.87 mm).

Plywood decking used as a sub-floor typically has a thickness of 3/4 inch (19.05 mm). It is also a common practice to use tongue and groove plywood, a type that joins at its seams, for flooring applications. It reduces movement between the two pieces, providing a stable surface to...

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Isn’t it a little strange that your roof — the barrier between you, your family and the wild elements — is essentially a stranger to you? You generally see your roof from a distance. Even then, you’re just seeing the shingles. You rarely trod upon your roof itself. You know it’s important, obviously, and you know that roof replacement is a big job when the time comes. What, however, do you know about the whole roof system?

Maybe not much. Let’s peel back the shingles, metaphorically speaking, and take a look at everything that is inside of your roof. This inside knowledge will help you to understand how your roofing system protects your home and your belongings, and may give you a greater appreciation of the clever science that powers an effective, efficient roof.

There’s more to your roof than shingles and wood:
The anatomy of whole roof system

First of all, let’s take a look at the guts of your roof. The infographic below offers a good, quick glance at...

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From: Internet Comment

[Summary]What is better for a roof, plywood or OSB? While watching the builders next door do their thing, I became curious with their technique to install plywood on edges neighboring the next townhouse, and OSB for the rest (which for these narrow How to Fix

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What is better for a roof, plywood or OSB?


While watching the builders next door do their thing, I became curious with their technique to install plywood on edges neighboring the next townhouse, and OSB for the rest (which for these narrow

How to Fix Rotted Roof Decking


Rotted roof decking cannot be repaired -- it must be replaced. Roof decking sits beneath the shingles used to protect the house from the weather. Moisture that passes this covering and seeps into the ...

GP Roof Sheathing Installation Instructions


Plywood vs OSB


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For Sale/Rent

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The Lodge at Cricklewood | All images via Airbnb

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All of these come with large-screen TVs in rooms that can accommodate a larger party for watching the game. Some have cable (which you shouldn’t need if you can get local TV), and one even has a home theater.

The hosts are also glad to make themselves scarce when you and your friends roll around, though you will be able to reach them should you need something. (And we’ll wager they’d...

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Any structure that is properly constructed and maintained can have indefinite lifespan.

Proper maintenance includes maintaining a stable temperature and humidity, and protecting the structure from natural elements. Water is the biggest enemy of any form of construction.

A typical suburban American tract home built in the first two decades of the 21st century has a wood-frame structure, external siding of vinyl or fiber cement, asphalt composite roof shingles with a fiberglass substrate, and interior wall and ceiling sheathing of gypsum drywall. This is built on top of a concrete foundation that is placed on undisturbed mineral soil (clay, not humus).

Building science has advanced tremendously in the last two decades. Twenty years ago, wood-frame buildings were not as resistant to weather as they are now: insulation is better; indoor climate control is better; paints are better; siding is better; and roofing materials are better. Construction methods have also...

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Wood Plank - If you have a wood plank roof deck, it is not recommended that the wood planks exceed eight inches (8") in width due to their propensity for warping.

Plywood - If you have a plywood roof deck, make sure that you have at least 15/32" (or Ѕ") plywood thickness if the rafters are set at sixteen inches (16") on center. If your rafters are twenty-four inches (24") on center, it is recommended that your plywood is at least 5/8" inches thick. All plywood should be Exposure 1 Rated plywood and be rated for structural use by the APA-The Engineered Wood Association. This is indicated by a stamp on the plywood that states "32/16" rated. What this means is that particular board is rated for sub-flooring where the floor joists are 16" on center and for roof decking where the rafter or roof joists are 32" on center. The APA recommends a 1/8" gap be left between adjacent panels of plywood/OSB.

Oriented Strand Board (OSB) – If you have an OSB deck, it is ...

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Reed Cleaning and Making into Bundles in China

I visited a potential client recently with a thatched roof which was 60 years old and who asked about which country the Water Reed would be sourced from should he decide to go ahead with the re-thatch of his roof.

I explained that in the last year we have used Hungarian, Scottish, Chinese and Turkish reed and that I would supply samples of all these plus Polish, Norfolk and Ukraine so he could see himself the reed before it went on the roof and feel the texture and relative hardness of the reed.

It has to be said that there is no guarantee that the reed from one country will last longer than the reed from another and there are so many factors beyond the Thatcher’s control such as the humidity in the area where the reed is bundled up and stored and how well the reed is protected from the weather before it is sold to the Thatcher.

http://www.nsmtltd.co.uk/howLongWillAThatchedRoofLast.html

The Lifespan...

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Tile roofs have been a primary roofing option for hundreds of years and are made of local, natural and recyclable materials such as terracotta (also known as clay), slate and concrete. These hefty materials all sound durable, but how long do they truly last? Let’s find out.

According to a study performed by the National Association of Home Builders (NAHB), a trade association that helps promote and represent the policies of the U.S. housing industry, the lifespan of tile roofs far exceeds that of any other roofing material. As indicated in the graph, throughout a 75-year period, a natural slate roof will need to be reroofed 1.5 times, which means it lasts upwards of 50 years. Concrete tile, such as those manufactured by Eagle Roofing Products, and natural clay tile will need to be reroofed 1 time during this period, meaning they last 75 years or more.

The long lifespan and durability of these roofs go hand in hand. With proper installation and routine maintenance,...

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License: Image author owned

Most homeowners consider singles or insulation as the major parts of a roof. One of the most overlooked inside layer that is hidden away is the roof sheathing. This underlying layer of the roof is very critical to the proper functioning and the lifespan of a roof. The roof sheathing is the layers of plywood or wooden planks installed beneath the shingles or rafters. There are two types of roof sheathing – open and closed. The kind of sheathing depends on whether there is space in between the boards. Open sheathing installation is the cheaper of the two, but closed sheathing is usually the most effective. The sheathing layer again has a thickness ranging from one to five inches. The thickness considered is based on the weight, height and the effectiveness of the material.

Features of effective sheathing

It is found that nearly two thirds of all roofing activities involve renovation or replacement. In such cases, there may not be a...

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Tip 1: Have an Annual Inspection

Inspections should take place at least twice a year, preferably in the spring and autumn, recording and reporting all changes in the condition of the roof.

Look for the following conditions: roof surface problems such as blisters or bubbles, worn surfaces, open seams, visible cracks, ruptures or other holes and loose surfaces or fasteners.

Drainage problems such as standing water, clogged drains and gutters, and bent or missing drain covers; flashing problems including cracks, holes, rust, missing flashing and failed caulking at joints between flashing and parapet walls; masonry problems on parapet walls.

Such as deteriorated mortar joints, brick, coping stones and accumulation of debris.

Such as old roofing materials and household rubbish.

Below you can see some classic Flat Roofing repair issues

Tip 2: Check Roof After Storms, Snow or Heavy Rain

It is also important to check the...

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Plywood is considered to be the best form of wood used for construction of houses and office buildings these days. Considering the many varieties that it is available in and the excellent ways it can be used, there is no wonder that most people want it for their home construction. However, despite the many feature and qualities that it possesses, there are some concerns regarding the structural integrity and lifespan of plywood in the mind of the people. Questions like, how long would the plywood last and when will I have to make repairs or replace the plywood are commonly asked by people when thinking about making use of plywood in their homes.

Expected Lifespan of Plywood

It is almost impossible to accurately ascertain the lifespan of any wood. However, an estimated guess would be around 10 years or more. However, there is a chance that some of the varieties of plywood might have a much higher life expectancy than that. There are many factors that determine how...

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3)Distance from bottom of joists to ground

- A deck that is close to the ground can be visually pleasing, but it will have a short life. Moisture is constantly rising out of the soil, and a deck built just above the grade lacks adequate ventilation to disperse the moist air created. When a deck is sitting on or just above the ground, you can expect that the lifespan will be cut in half; and, in some cases, the joists will rot as fast as the deck boards above them.

The deck in the photo below is an example, built close to ground and in an advanced state of deterioration. As you look at the image, it’s easy to visualize how each joist creates a separate compartment of unventilated wetness.



4)Type of foundation - The best deck foundation is stable—with a real concrete foundation, not precast deck blocks sitting in the dirt— and has no wood in contact with the ground. But, if you do end up installing wood posts in the ground,...

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Your contractor must fill out and sign an affidavit stating that the roof deck upgrade requirements have been met and submit it to the local building department as part of the requirements for a final roof inspection. They only apply for “roof replacement,” where the previous roof is completely removed down to the sheathing. If your roofing contractor is doing a “reroof,” which is where the new roof is applied over the existing roof, the upgrade of the sheathing is not required. But it’s just a one-time reprieve. When you need a new roof again, it all has to come off and the sheathing upgrade done, because you are only allowed to reroof over one layer of roofing.


While we hope you find this series of articles about home inspection helpful, they should not be considered an alternative to an actual home inspection by a local inspector. Also, construction standards vary in different parts of the country and it is possible that important issues related to your...

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