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EVS Installation

It can take as little as 10 minutes to install a EVS Glazing panel, compared to over three hours to retro glaze a traditional double glazing panel


Retro glazing your home shouldn't be expensive!

EVS is a simple clip on system that saves time and cost.

Traditional Retro glazing requires a high level of skill, specialised tools, takes a lot of time, and can leave a lot of damage especially to fragile lead lights, timberwork, and paint. EVS panels can take 10-20 minutes to install, but preparing the window may take longer. Most of the time is spent on cleaning and preparing the paintwork around the existing window. Blistering off paint and areas of cracked putty and pockets of rot can all be repaired and be well presented before installing the EVS panels over the top.


Transform old timber windows back to new

The EVS Step–by-Step guide, how to refurbish old timber windows back to new.  Fast, simple and affordable!

Some people would think that old windows with putty falling out, a bit of rot and paint flaking off is the end of the road for old character windows, and it would be better to replace them with new aluminum windows. Before you go down that path, think of the pros and cons of installing replacement aluminum over restoring your existing timber frames with EVS.

The advantage of aluminum or PVC window replacement is that they don’t need painted and they won’t rot, the disadvantage is the extra cost and the loss of character, which could devalue your home.

The advantage of keeping your timber windows getting better insulation performance, maintaining your homes character, getting extra weather protection, and spending a lot less money. DIY improvements to your windows can provide you with a professional results while saving you even more cost.


Step 1: Inspection

Inspect your windows to determine how much rot requires attention. Flaking paint and putty falling out is simple to fix, but fixing rot requires more attention.


Step 2:
Tap Test

The tap test is a simple way to find rot by hitting the surface with your knuckle and if it’s a high pitch noise your timber is solid and low thud your timber has rot.


Step 3:
Carve out Rot

We recommend that you carve our rot rather than cut rot out. This technique is like being a dentist and inserting a filling, by drilling out the soft core and leaving the solid.


Step 4: Follow the Shape

You can use a variety of tools from a drilling, cutting and grinding the rot out which leaves a very organic shape. Don’t cut square edges because they are more likely to crack later.


Step 5: Treat Rot

Paint the exposed timber with a rot treatment like Metalex or timber hardeners that penetrate into the remaining timber and prevent rot from spreading.


Step 6: Timber Inserts

Use tantalized treated pine to make inserts to replace the rotten sections. (Timber decking is ideal) Cut and shape them to loosely fit back in the space. Add screws as spikes to key the bogg within the cavity.


Step: 7 Timber and Bogg

Make sure you have your external edges inline with the external faces of the frame, so you can have timber corners to finish against. Fill the gaps with builders bog, sand and paint.


Step: 8 Face prep. 

Your EVS needs to fit against the face of your timber sashes and any obstacles need trimmed back to a smooth face. The old corner pegs work their way out over time so if they are fixed then cut them.


Step 9: Grinding paint.

 You can spend a lot of time sanding paint back, so using a grinder sanding disk takes a lot less time. The main thing s to get rid of lose paint and paint build-ups. The key to using a grinder is to keep it moving and not let it dig groves.


Step 10: Edge scraping; 

Most old windows have badly painted edges and scraping them back against the putty line is important to get a good finish that looks neat. Don’t worry about chipping or dislodging old putty, get rid of any lose putty as well.


Step 11: Mask edges

Mask your glass edges a small distance away from the putty line. This line is very visual so keep your lines as straight as you can


Step 12: Trim Masking

You can quickly mask your panels then came back and trim off the corners leaving a nice square corner cut, 


Step 13: Finish Masking

Spend time to get all your masking done for the windows you are working with as you have clean fingers and getting the masking finished will minimize mess.


Step 14: Trim Nib

Corking guns come with fine nibs. This job requires a slightly larger opening to provide a good flow of silicon. Make sure the silicon says its paintable and depending on your job you can use wither white or black.


Step 15: Corking

Corking the edges is a bit of a skill and you can make a big mess if not done correctly. Make sure you put a good amount where the putty has fallen out and a little amount around the other edges, to cover the putty.


Stage 16: Fingering

The finger has been the simplest way to finish silicon, by runing it straigh over the edge you have just corked, in one stroke. Avoid multipal short strokes and leaving it too long as silicont will set and get messy. Keep your finger clean by using a rag and soapy water to smooth the silicon surface. 


Stage 17: Painting

Speed is critical as you need to quick paint straight over the fresh silicon, before you move to the next window. Use a water based exterior primer top coat with good UV resistance. You only need to paint the putty edge and 1 cm in from the putty edges, not the whole frame.


Stage 18: Remove masking

Removing masking has to be done straight away to produce a nice sharp line finish and avoid the silicon from making strands that spoil the edge. If you wait until the paint is dry you will need to cut the edge of the masking tape with a knife before your remove the tape.


Stage 19: Undercoating

The rest of your windows can be prepared and undercoated ready of top coating after you have installed your EVS panels. You may want to double coat your inside putty edges to ensure a good coat that covers well. 


Stage 20: Cleaning

Clean up any messy edges with a razor blade after the paint and silicon has dried. You can also clean the rest of the glass to remove tiny paint spots and silicon that may have landed on the surface. Each panel should have taken no longer than 20-30 minutes to get it ready for EVS glazing.

Talk to us about your Retro Glazing project

Phone: +64 (0) 3 455 0957 

EVS Head Office 

EVS Glazing Ltd
85 Hillside Road
South Dunedin
New Zealand


Phone +64 (0)3 4550957
Mobile: +64 (0) 27 4346 912