How to make WPC Windows? | Complete Installation and Assembling Guide


Being an architect is not easy! You have to discover answers to all your questions before the application of the right product. But, what will be the right product? It is a significant question!

The right product is the one that will encourage you to define your spaces, with your imagination, with the right product yourself! And we are here to bring light to the right product that will give you a remarkably satisfactory experience! 

Likewise, If you are projecting to finalize the best suitable material, but are confused to choose in between wood, aluminum, or UPVC… And you believe that wood will get damaged over time and aluminum or UPVC is not that ‘pocket friendly’ then yes, you should choose WPC! 

Wood Polymer Composite or WPC is the one-stop-shop product that satisfies an architect’s checklist immediately. In this blog, you will find your mightiest product which will give your spaces a seamless finish and has unmatched strength to kick out moisture, termite, and fire in a wipe of time!

From the product’s description till its installation, let’s begin…

Yes, WPC window and door frames are inexpensive and come with strong properties that make them an excellent substitute for all the traditionally used materials. 

You must be thinking about what WPC is all about as it is inexpensive than aluminum and UPVC and its properties are stronger too! So here is it… WPC window and door frames are made of 70% virgin polymer, 15% wood powder, and 15% additives that make WPC 100% waterproof, 100% termite & borer proof, and a UV resistant product.

So when manufacturing a WPC window frame your first step is to measure the opening window to know the required length and width. Once you will find the right measurements, ask your carpenter to do a miter joint of a 45-degree angle on the WPC raw frame. The purpose of doing a miter cut on the frame is to get a seamless joint with precision on the product. 

How will a miter joint be made? It is simple, it can be done with the help of a panel saw or a hand saw(aari) (1). If you find that maybe you have not used WPC ever in your projects previously then you need not worry about its making process. WPC might be new material but its customization and working on it is as traditional as done on conventional wooden tools. The process is the same as applying a jack plane(randha)(2) on the wooden product’s manufacturing. 

Now the next step will be ‘the joining’. How will WPC be joined to become a smooth frame? Do I use fevicol to join the 2 – Mitre joints of 45-degree or it will be screwed only? Hey, Not at all! 

Use conventional solvent cement(3) which is a tough glue that is primarily used to protect and build products. Solvent cement is not a rare product of markets, you will find this easily at the PVC pipes or a hardware shop. Use solvent cement in little quantity to the miter joints by spreading it evenly on the surface where you made the miter joints. 

Remember to be careful when applying solvent cement, as it is adhesive, which means it dries fast! Now join the pieces together by screwing two screws at the bottom and two screws at the top of the miter joints. Now you need 2 screws, 3 inches – full thread screws that are star-headed SS screws (4). They are highly suitable for exterior applications as they won’t get rusted by the outdoor moisture and harsh weather conditions. 

If you want a fixed glass at the center and you want an openable shutter on the sides then the center rail is important for it! For building the one, make a cut on the panel saw, after making this cut, eliminate the undesired area, with the help of a hand router machine(5). 

After receiving the result from the hand router now apply solvent cement for assembling the desired window. For a perfect, seamlessly strengthened frame, screw the frame now again from top and bottom with 2 screws, screwing to both sides, again use 3Inches – star-headed – SS thread screws.

Simple, quick, and smooth. Hats off, your WPC window frame is readily assembled!

It’s time for the plug & play installation of the WPC window frame to its wall… 

Does the installation of WPC door/ window frames have a separate new methodology? This question is always there in the curious minds of the first-timers! But with WPC everything is hassle-free, my friend. 

With the lightweight and composition of the WPC window frame, the installation becomes easy and simple for a carpenter. Just the way you install a wooden door frame or any other conventional frame into a wall, the same will be applied here! 

By using holdfasts (6) and fasteners (7) you can easily install a WPC window frame to the wall either before building a wall or after customizing the frame area in the wall. For instance, if the frame is about 7ft, then use 3 holdfasts or 3 fasteners, that will be installed in any of the WPC frames very easily. Once installed, if you find gaps above the frame’s area it’s time to apply PUR Foam(8) for a fabulous finish.

Fill the unwanted gaps with PUR foam in the available cavities on the wall. PUR foam is suited for most insulation purposes that is an incredibly durable material with high stability to provide a smooth finish to the frames on the walls.

This window frame is a product of quality and no maintenance. When you give this product an indulgence in your spaces, definitely you will experience priceless satisfaction for a lifetime! Because WPC is not just a product but a holistic solution that is eco friendly, and an A- Class fire retardant that suits best for exterior as well as interior applications. 

Ecoste aims to provide awareness to its clients by serving them with utmost sincerity. We will be happy to serve you with our WPC solutions that are made with honest composition and are GRIHA & IGBC Certified. 

If you want a virtual assembling and installation tutorial, don’t forget to watch Ecoste’s video on assembling and installation of a WPC window frame, where you will have an absolute step-by-step guided experience for the application of WPC Window Frames.

Here is your tool summary to eliminate your last-minute panic: 

Assembling tools: 

  1. Panel Saw or a Hand Saw(Aari) 
  2. Jack Plane (Randha) 
  3. Solvent Cement (Glue) 
  4. 3Inches – star headed – SS thread screws
  5. Hand router machine

Installation tools:

  1. Holdfasts
  2. Fasteners
  3. PUR Foam



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