Showing posts with label plywood. Show all posts
Showing posts with label plywood. Show all posts

Wednesday, 19 June 2019

What are the different types of exterior plywood?

22:16:00
The history of plywood, whose production began in Portland, takes us back to 1980s when it was patented. However, exterior plywood came into existence in 1934 with the surge of waterproof adhesives. Over a period of time, Plywood evolved and now we have different variants of the same. CDX plywood is one of the most common types used by the builders for the exterior. However, there are other variants as well, which we will explore later in the blog.
Exterior Plywood
Exterior Plywood

(Snap at- speaking angrily to someone so it doesn’t fit here)

A brief discussion about Plywood

Wood veneers are bound together to form flat sheets which are called plywood. These are highly versatile products which find active usage in both the interior and exterior of a construction. Normal plywood consists of three piles having grains in alternate piles arranged at right angles. 

The plywoods are grouped as: 

1. Exterior
2. Interior
3. Structural
4. Marine 

Why are people opting for plywood?

Plywood offers a series of benefits, some of which are: 

#1. Enhanced stability- Plywood brings with it the inherent properties of the parent wood from which it is made, thus ensuring stability. 
#2. Impact resistance- Another benefit which plywood brings with it is the higher impact, which makes it withstand short-term overload. The laminated structure of plywood helps in distribution of load from impact over a large area on the opposite surface, thus ensuring better stability, and that’s why people are opting for exterior plywood. 
#3. Temperature and moisture resistance- Most of the exterior plywood comes with cross-laminated structure, thus ensuring that the sheets are able to withstand temperature and moisture resistance.  This becomes a great property for the plywood which is used for flooring. 
#4. Resistance to chemical- Plywood can easily withstand the corrosive effect of chemicals and hence find active usage in cooling towers and other chemical prone places.

Types of Exterior plywood

  • CDX plywood- This is one of the most common types used for the exterior. They are available in 5/8, ¾ and ½ thickness. You can choose between A, C and D grade where A is cabinet grade and C and D is construction grade.  In addition to this, you can also find ABX, BCX, and ACX range, which are better than CDX. 
  • Marine grade- It consists of knot-free sheets and nullifies the probability of formation of water pockets, which makes it waterproof and thus proving to be a great material for the exterior. 
  • Pressure-treated - It has a greenish appearance and slightly oily surface. It is chemical infused plywood and is resistant to mildew. Some of the chemicals used for the treatment of this plywood include copper azole, ammoniacal copper quat, and chromated copper arsenate. 
  • Oriented strand board (OSB) – you can find active use of this plywood in sheathing and decking. This is comparatively expensive plywood. 
  • T1-11- This variety of plywood for the exterior is used as siding. It is exterior-grade plywood designed for use as siding. It has a rough-sawn appearance. It can be painted in the desired color to match the color schemes.

Exterior Plywood
Exterior Plywood

 How is exterior plywood different from interior plywood?

Interior plywood focusses more on look and style, whereas the exterior ones need to be more resistant and durable as it has to combat harsh environmental conditions. Exterior plywood can be used in the interiors, and the exterior but interior plywood cannot be used on the exterior. If you are looking for aesthetically pleasing outdoor exterior plywood, then the above-mentioned categories are some of the popular ones. 

Conclusion- Plywoods have become a great way to enhance the durability and longevity. With its multitude of features like durability, sturdiness, highly resistant, they are a great choice for lamination.
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Friday, 28 July 2017

Types of plywood: A walkthrough

02:18:00
Plywood is a man-made replacement of wood which is extensively used in various applications. Plywood is well-known for its versatility in applications. Plywood is actually a laminated product made up of numerous thin wood strips laid alternatively and bonded using glue onto strong stable sheets. Due to this, the susceptibility of plywood to expansion and shrinkage due to moisture is extremely low. 
Plywood
Plywood
A plywood is made of odd number of layers called plies with equal number of plies sandwiched on each side of the center ply. This way, the center plies are always parallel and this kind of construction makes it a lot stronger than a board of equal thickness cut from a tree. Plywood is generally graded using letters A, B, C, and D, where A is the best quality with no blemishes and well sanded while grade D is the one with a lot of virtual blemishes. This means grade A is suitable for a finishing material while D grade plywood is not.

Plywood are generally graded in pairs. One side refers to the better side, which is called the face and acts as the finishing surface and the other side is the back side. For example, a plywood of grade A-C will have a well finished face and a relatively unfinished back of grade C.

There are 4 common types of plywood bonding types. These variations in glue types are used depending on what conditions the material will be subjected to after the installation is done. Based on this, there are 5 types of plywood:

  • Structural plywood: This is the type of plywood which is used when appearance is of no importance and stability and strength is the primary concern. It is commonly used in concrete forms at construction sites. The resins and binding glue used to join the plies are manufactured to provide extra strength make a structural plywood extra strong. This type of plywood is not aesthetically pleasing. It is generally of C-D grade.
  • Marine plywood: Marine plywood is exclusive designed for applications where there is a need of high moisture resistivity. The adhesives used in this type are of high quality which neither dissolve in water nor absorb moisture. It is hard and is suitable for all types of marine applications. As this is manufactured using hardwood and high-quality adhesives and has appealing finish as well, it is costlier than other types of plywood. It is generally of A-A grade.
  • Interior plywood: This type is made of various species of hardwood and softwood and used precisely as it name mentions - in interior applications like wall sheathing, furniture, cabinetry, etc. This type of plywood is available in many grades according to requirement but manly have one surface of grade A to get an attractive finish. There are species like birch, oak and cherry available for design purposes.
  • Exterior plywood: This is the most commonly sold plywood type at any home center. This type is more resistant to moisture than interior plywood as this is used for exterior used and is exposed to nature and is prone getting wet in rain. So, a little moisture resistivity is necessary. Similar to interior plywood, all types of grades are available in this type as well. The grades A-C, B-C, and CDX are the most common ones.
  • Sanded plywood: In case of making cabinets, one side has to be visually attractive as that will be visible on the external side of the cabinet, to the user. For such applications, sanded plywood is the best choice. This type is generally of A-C grade where one side is sanded and the interior side, which is not visible to the user is of lesser C grade.

You can choose the type of plywood according to your application needs and use it as a perfect replacement of wood. These customisable property of plywood is the reason it has become immensely popular. 


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