Over the years many different types of glazing seal have been used by different Greenhouse brands, some brands have even used different glazing seal as they've developed new products, this guide will help you determine which seal to use when renovating your greenhouse and how much you may require
There are several types of glazing strip used to cushion the glass and provide a seal for greenhouses, some are interchangable and have different properties while some will only work on specific greenhouses, it's important to select the best type for your environment and for your particular glazing bar profiles.
It is very important to use appropriate greenhouse glass seal products like these, sometimes people don't ask how to seal greenhouse glass and assume silicone will be okay however silicone is an absolute nightmare when it comes to replacing glass in the future or doing any work on the greenhouse that involves removing the glass, we have seen greenhouses have to be scrapped because of silicone being used so we would never recommend it.
Traditionally a non setting butyl mastic or putty was used as a gasket, this seal is still used in some greenhouses and provides an excellent seal by sticking to both the glazing bar and the glass or polycarbonate.
Butyl Mastic comes on a roll and is cut to size before being stuck onto the bars for the glass to be stuck into place, butyl mastic is quite sticky and can be tricky to work with but provides a very secure sticky cushion for the panels.
If you wish to keep your traditional greenhouse as original as possible of if you encounter extreme weather conditions then this may be the best type for you
We sell 150' and 200' rolls of this 4mm bead gasket
Similar to butyl mastic in that it can be stuck over the top of old mastic after scraping the worst of it off the greenhouse bar; this flat tape seal can save a great deal of time and is very easy to use.
It can also be used on greenhouses where the glazing seal has to be threaded into or pushed into the glazing bars, with our self adhesive tape seal the old brittle seal can be either pulled out or cut down to the glazing bar with a blade to allow the new tape seal to simply be stuck on over the top.
This 20m roll of seal is 10mm wide to span over the glazing seal channel and 3mm deep to provide a good cushion for the glass.
Crittall Greenhouses were and remain a very popular garden building, they are no longer in production but they were excellently built and there are still hundreds if not thousands still being used and renovated in the UK, we have sourced an equivalent seal to their original 4mm glazing strip which simply pushes into the glazing seal channel in the bar
Our Crittall Seal comes in 15m Rolls
Elite Greenhouses have been in production for over 60 years and their most popular glazing seal has moved away from the traditional buytl mastic to a "thread in" neoprene seal, this seal is threaded into the glazing bars before the greenhouse is constructed and is very hard wearing and effective
Elite Seal comes in 15m or 50' Rolls
Established in the 30s Halls Greenhouses have gone through many changes in their production processes and location, their seal has changed from a "push in" style in the past which is now best replaced with our self adhesive tape seal.
Halls seal is now a "push on" style which is pressed onto a ridge on the glazing bar, this style is not interchangable with any other type of seal
Halls seal generally comes in 18m rolls which come as two runs stuck together, the 2 runs need peeling apart before use.
https://www.elloughton-greenhouses.co.uk/shop/Genuine-Halls-18m-Greenhouse-Glazing-Seal-p13323137
Similar in profile to the Halls Seal but slightly larger which can make this seal a little easier to use, using the seal straight from a bucket of warm soapy water can help further in fitting.
Eden and Juliana Greenhouses have also changed their seal design to a "push on" style however it has a slightly simpler profile to the Halls seal, their "U" shaped design simply pushes onto a ridge on the glazing bar and again is not interchangable with any other type of seal
We supply this type in both 31m and 63m rolls
https://www.elloughton-greenhouses.co.uk/shop/Genuine-Eden-31m-Greenhouse-Glazing-Seal-101-p44347936
https://www.elloughton-greenhouses.co.uk/shop/Genuine-Eden-63m-Greenhouse-Glazing-Seal-206-p44347938
One of the most common questions we get regarding greenhouse glazing seal is "How much seal do I need for 6x8 / 6x10 / 8x8 / 8x10 / 8x12 etc. Greenhouse?"
We have a guide for the most popular greenhouses based on the average requirements for these sizes, greenhouse construction can vary quite significatly from brand to brand so it's best to measure exactly but our guide has proven very helpful in the past
6' x 6' Greenhouse - 194' / 59m
6' x 8' Greenhouse - 233' / 71m
6' x 10' Greenhouse - 269' / 82m
6' x 12' Greenhouse - 299' / 91m
8' x 8' Greenhouse - 299' / 91m
8' x 10' Greenhouse - 350' / 107m
8' x 12' Greenhouse - 400' / 122m