Overlay grade plywood is a type of plywood that features a thin layer of high-quality veneer or a special surface material bonded to its top layer. This overlay enhances the plywood's durability, appearance, and resistance to moisture and wear, making it suitable for applications like furniture, cabinetry, and decorative surfaces. It is often used when a smooth, finished look is desired without the need for extensive finishing work.
MDO stands for Medium Density Overlay
Marine grade plywood and treated plywood aren't the same thing. Marine grade plywood has special glues and woods that will withstand constant immersion in water. Treated plywood is regular plywood that has been run through a pressure treating cycle. Paint will stick to treated plywood if you make sure to let it dry for a few months before you paint.
For roofing, it is recommended to use exterior-grade plywood, specifically CDX plywood, which is durable and weather-resistant.
The weight of medium density overlay (MDO) plywood typically ranges from 30 to 50 pounds per sheet, depending on its thickness and specific grade. A common thickness for MDO plywood is 1/2 inch, which usually weighs around 40 pounds per 4x8 foot sheet. The weight can vary slightly based on the manufacturer and the specific material composition used in the plywood. Always check the product specifications for the most accurate weight information.
You can used exterior grade plywood when tiling floors, but it is only an acceptable choice. If going over a wood substrate, the best choice is a mudbase or cement board.
Marine grade birch plywood is a durable and weather-resistant material that is ideal for outdoor furniture. It is resistant to moisture, rot, and decay, making it suitable for outdoor use in various weather conditions. Additionally, marine grade birch plywood is strong and stable, providing a sturdy foundation for furniture that will last for years.
Marine grade plywood has a density of 300 to 400 kilograms per cubic metre, depending on the type. ( I found this answer on google inside 20 seconds, by the way. Learn how to use the web, guys!)
bwp = boiling water proof bwr = boiling water resistant THERE IS NO DIFFERENCE !!!!!!!!!! Source: http://blog.positiveindians.in/plywood/bwp-vs-bwr-grade-plywood.html The acronym BWP stands for 'Boiling Water Proof', While BWR grade means 'Boiling Water Resistant' plywood. The general naming convention used in the industry is that BWR grading is used for marking plywood, while its counterpart BWP grade is used in the case of Blockboards. Technically speaking there is not much difference between these two terms. The quality tests on BWR grade plywood sheets, as well as BWP grade blockboards are quite similar. The glue used in the construction of both these types is synthetic plastic resin (phenol formaldehyde) which is considered better than Urea formaldehyde resins used in commercial MR grade (Moisture resistant) plywood sheets. If a board is marked with BWR it means that it is a waterproof exterior grade plywood, and if it is marked BWP then it should ideally mean that it is an exterior grade waterproof block board. Both BWP and BWR grades are widely used in the construction of furniture that is likely to get some exposure to water. Hence it is a preferred choice of material for making kitchen cabinets and other kitchen furniture. For quick difference between plywood and block board: Plywood -is thin sheets of veneer stuck together Blockboard - is blocks of solid softwood covered by sheets of veneer on both sides Or you can get it in detail at : http://blog.positiveindians.in/plywood/plywood-vs-blockboard.html
The best practices for using plywood for roof construction include ensuring proper installation techniques, using the correct thickness and grade of plywood, providing adequate ventilation, and protecting the plywood from moisture and weather exposure.
Yetiply is the Best Plantation Timber Plywood in India. She is known as one of the cheaper-grade plywood, made at the factories in Kerala using plantation timber available in large quantities. that provide high-quality plywood in India. yetiply is one of the top plywood manufacturers.
The best practices for using plywood for roof sheathing include ensuring the correct thickness and grade of plywood is used, properly securing the plywood to the roof framing with the appropriate fasteners, staggering the plywood seams to increase strength, and providing adequate ventilation to prevent moisture buildup.
For roofing, it is recommended to use exterior-grade plywood that is at least 5/8 inch thick. This type of plywood is designed to withstand weather elements and provide a sturdy base for the roof.