Despite its obscure name and haphazard appearance, there is more to OSB than meets the eye. It’s actually a versatile timber-based board that’s perfect for a wide range of DIY and home renovation projects.
It is commonly used as a substitute for plywood and in some cases, a Plasterboard optionalAdd an industrial aesthetic to interior design projects. While it could be argued that it is less visually appealing, its design still makes it a very attractive option for many DIY builds where aesthetics are not the number one priority.
Here, we look at where it can be used, its advantages and disadvantages, and how much you can expect to pay.
What does OSB stand for?
OSB stands for Oriented Strand Board. Paul Kerr, building expert The BeatsonsExplains its makeup. “It’s basically a wood panel made by heat pressing wood strands with glue.”
At Mark Irving, Building Expert Build and plumbExplains what makes it suitable for use in various DIY projects. “Boards are strong and durable, which means they are commonly used for construction projects.”
Buy OSB boards and tools to secure it
This 18mm thick OSB board comes in sheets measuring 2440mm x 1220mm, making it ideal for floors and walls. It is free from natural defects and moisture-resistant
Rustins Quick Dry MDF Sealer
A fast-drying sealer that works on most wood, including MDF and OSB. The sealer goes on milky white, so you can see where you’ve painted, but it dries clear
This brush and roller set is ideal for sealing and painting. It includes a 9-inch roller tray, 3 medium-pile roller sleeves, and 1-inch and 2-inch brushes.
Paul Kerr is a building specialist at Beatsons Building Supply Ltd, where he advises homeowners and trade professionals on sustainable, practical solutions for home renovations.
Mark has over 20 years of experience in the building sector, leading to a wealth of knowledge around building and renovation that he enjoys sharing with others looking to complete their own building projects.
Popular Uses for OSB
OSB is a popular choice for many DIY and Home renovation project, but it is typically used indoors, explains Mark Irving. “OSB is commonly used in interior construction projects, as it is extremely strong and durable. Generally, it is used for cladding walls, ceilings, Loft boarding and site hoarding.
“OSB can also be used for subfloors, partition wallsand shelves,” he adds, “because they provide a solid, stable surface.”
OSB is rarely used for exterior work, notes Paul Kerr, “because the boards are generally not weatherproof, and should not be used for exterior projects unless specially treated.”
Yet if the board is protected or treated, it can be used in a variety of projects, Mark continues. “OSB can be suitable for large-scale building projects such as Timber frame constructionShed and DIY Renovation.”
And, while it’s often covered, it can also be left uncovered, says Paul. “You sometimes see the odd interior design project using OSB for rustic shelves and tables,” he agrees. It is sometimes left bare on the walls to create a more industrial aesthetic.
Advantages and disadvantages of OSB
Mark Irving points out the main advantages and disadvantages of OSB:
pros
- Cost-effective: It is generally cheaper than plywood yet offers the same structural strength, making it a popular choice for large construction projects where budget is critical.
- Durability: Because the wood fibers are layered in different directions, OSB offers exceptional load-bearing strength, making it ideal for flooring and roofing.
- Consistency: OSB panels are manufactured in consistent sizes and densities to minimize weak spots and voids commonly found in wood projects.
opposition
- Sensitive to moisture: Standard, untreated OSB can often swell or deteriorate if exposed to moisture and water, especially around panel edges.
- Appearance: Although it’s incredibly practical, OSB has a rougher, more industrial look than standard lumber or plywood, so it’s often not the best choice for decorative applications.
- Heavy: OSB is generally heavier than standard plywood, meaning transport and handling can be more difficult.
What sizes does it come in and how much does OSB cost?
Along with its strength and durability, there’s another reason why it’s so attractive to DIYers, and that’s the price. However, the price is determined by many factors including size, thickness and grade.
“OSB is one of the most affordable options for construction, costing between £15 and £35 per sheet,” says Mark Irving.
“The industry standard is 2400mm x 1200mm, and thicknesses vary from 9mm to 18mm,” Paul Carr elaborates. “The thinnest OSB usually starts at around £10 and usually doesn’t sell for more than £25.”
As an example of price, this OSB 3 OSB 2440mm x 1220mm x 9mm from B&Q Selling for just under £20. The smallest size sells for around £11. This 18 mm OSB 3 OSB 2440mm x 1220mm x 18mm from B&Q Sells for £24.
OSB’s cost is also why it’s considered an attractive alternative to plywood in certain situations, Mark continues.
“In general, OSB is inexpensive, making it an ideal choice for structural applications where project appearance is less important than budget or performance.”
“It is usually about 20% cheaper than plywood board,” adds Paul, “which is why it is considered the most popular board for interior framing work.”
FAQs
Should I use nails or screws to fit the OSB?
Both nails and screws can be used to install OSB. Which one you use depends on the project. If installing OSB on interior walls, ceilings, and floors, screws are a popular choice because they are easier to remove if you need to replace any OSB. The screws will pull and hold the OSB tightly against any frame.
This Single Thread Countersunk Posi Screw from Toolstation will work. The screw length should be about twice the OSB thickness. If you are using 18mm OSB, 40mm or 60mm screws will be sufficient.
Nails are quick to install, especially with a nail gun, and are often used to fix exterior framing because they give more.
If nails are used, galvanized or stainless-steel ring-shank nails are recommended. such as galvanized nails Techwise Extra Galvanized Framing Nails from Amazon Good for general DIY projects, as long as it is not regularly exposed to moisture.
Can I paint or tile directly over OSB?
Yes to painting, no to tiling.
OSB is porous, which means it absorbs a lot of liquid. If you are going to paint the OSB, you will need to start with a primer/sealer, such as this Zinsser BIN from ScrewfixTo seal the surface and create a stable base for subsequent coats of paint.
When it comes to installing tile, it’s important to know that if you apply the tile adhesive directly to the board, the board will absorb moisture, causing it to fail. Tiles may fall off walls or begin to shift and crack. However, it can be used as a substrate for tiles if you install cement backer board (like this HardieBacker 6mm backerboard from B&Q) over OSB.
You’ll also need to make sure the OSB is secure and doesn’t flex. This applies more to floors than to walls or ceilings. If that happens, you will face connectivity issues.
How long does OSB last?
It depends a lot on its usage. If properly installed and protected, eg, with wall covering, it can last 20+ years. However, if left unprotected and exposed, it will depend on the environment. Internally, it can last for years, as long as it is not exposed to moisture.
If used externally and left exposed to the elements, OSB will be lucky to last a year. However, if well protected, such as with a sealant Ceramico Coatings Liquid Rubber Roof Coating from AmazonIt can easily last five years. To extend its life, be sure to seal the edges and reapply any sealant/paint every 3-5 years.
OSB is a multi-talented board; It can not only be used on its own, but is also a part of SIP (Structural insulated panels), for which is a popular product Building Extensions and houses.
