What Is Plywood Pattress? What Is The Plywood Pattress Thickness?
What Is Plywood Pattress?
A plywood pattress is a board fixed within a partition to which equipment can be secured, such as ceiling roses, power outlets, basins, and wall cabinets.
It typically carries 12.5mm plywood within the cavity of the partition and is used in construction technology for building masonry walls from the foundation up to the DPC level.
Understanding practices and procedures for preparing and installing systems and electrotechnical equipment are also important considerations when using plywood pattresses.
What Is The Plywood Pattress Thickness?
The nominal thickness of the plywood is 18mm, while the actual thickness may vary due to a tolerance allowance.
The plywood pattress panel size 1250 x 397mm is available in thicknesses of 15mm and 18mm.To accurately measure the plywood thickness, a caliper should be used.
What Is The Plywood Pattress Weight?
The weight of plywood pattress varies depending on the type and thickness of the plywood. A 4′ x 8′ sheet of 1/2-inch Marine Plywood typically weighs around 51 lbs, while a 3/4″ softwood plywood sheet can weigh up to 80 lbs.
SMARTPLY PATTRESS PLUS is an engineered OSB3 panel incorporating a continuous recess, available in 15mm and 18mm thicknesses and 1250 x 397mm panel size. It is suitable for a variety of projects as it is available in different sizes and thicknesses.
What Is The Plywood Pattress Lifespan?
Pressure-treated plywood can last up to 30 years or more outside, while untreated plywood used as floorboard can last up to 20 years with proper maintenance.
Plywood used for siding can last around 35 years, while plywood used for roof sheathing can generally last around 30 to 40 years. The quality of plywood is the most important factor in determining its lifespan.
Additionally, a gutter system that eliminates rainwater splash-back against the base of the siding can help extend its life expectancy.
Where Is Pattressing Required?
Pattressing is required when installing equipment such as ceiling roses, power outlets, basins, wall cabinets, and other electrical fixtures. It involves fixing a plywood or timber board within a partition to which the equipment can be secured.
Pattresses may be designed for either surface mounting or for embedding in the wall or skirting board. They are typically made from metal or plastic, with PVC or urea-formaldehyde resin often used for surface-mounted boxes and thin galvanized metal used for recessed boxes.
If the pattress is going in front of the studs, it may need to be cut to fit if it is not a proprietary product designed for use as a pattress. The suppliers of the pattress material should also provide information about site conditions, installation, and suitability for use.
What Size Is A Pattress Box?
Pattress boxes are available in single (1 gang) or double (2 gangs) sizes, with depths of 25mm, 35mm, or 47m. The UK standard size is usually a 35mm depth of the back box, and metal pattress boxes are designed for brick, masonry, and other hard wall installations.
White plastic surface-mounted pattress boxes and decorative pattress boxes are also available. PVC back boxes are commonly used within domestic and commercial industries, while a triple socket back box can be used to replace a single flush socket.
Back box extensions or box extenders are metal or plastic rings available in varying sizes and depths that fit around or just inside an existing electrical box.