Herzim trims, also known as screw cover strips, are used as a decorative trim to cover the screw heads and fixings in aluminium tracks and waist rails. They are commonly found on most caravans, motorhomes and some boats with aluminium window frames. These products are available in a large range of sizes depending on the size and type of track you have fitted to your vehicle.
This guide from Seals Direct discusses how to measure your herzim trim and aluminium track to identify a suitable replacement.
Video Demonstration
Although replacing this Herzim trim is a relatively straight forward process, there are quite a few stages that may cause confusion if this is the first time you have undertaken a replacement project like this. It is often useful to watch the entire process be completed by someone else, prior to replacing trims on your own van.
This video demonstration from Seals Direct runs through the process of taking measurements of your existing Herzim trim and aluminium track to identify the best replacement section. It then shows how to fit the new screw cover strip onto your vehicle.
Step 1: Measure the Existing Herzim Trim
Herzim trims are available in six widths; 10mm, 11.3mm, 12.3mm, 13.5mm, 14.9mm and 17.3mm. It is important to purchase a section that is the correct size for your aluminium track to avoid fitting a profile that is too loose or does not fit into the opening.
These sections are slightly different in shape and thickness but all have a similar curved profile. From experience, thinner strips such as our 12.3mm herzim trim are easier to fit than thicker sections.
By measuring your current herzim trim, you can easily identify the best replacement section. If the current profile has distorted, gently push down onto the top until it vaguely resembles the shape of the profiles in this drawing. This should allow you to measure the section in what was once its original shape.
Step 2: Measure the Aluminium Track
It is also important to measure the aluminium track where the herzim trim will be fitted. These tracks are manufactured in a range of different styles but will commonly resemble the shape of one of the profiles in this drawing.
You should measure the channel opening and base. The opening will usually be smaller than the base to ensure that the trim does not fall out of the channel.
Remove the end cap (if applicable) and use a vernier to measure the base of the channel. If you are not able to access the end of the aluminium track, you can take this measurement by cutting a thin strip of paper around 10mm to 15mm wide. Push the strip of paper through the opening so that it sits on the bottom of the aluminium track. Keep cutting the strip of paper narrower until it sits flush against the base of the channel without crinkling. Once you have cut a piece of paper that fits perfectly into the channel, measure its width.
Step 3: Ordering the Correct Replacement Herzim Trim
Once you have identified which sized product would fit best into your aluminium track, use the table below to purchase a new section. These products are available in a selection of colours, depending on your chosen style and preference.
View our full range of Herzim Trims and Screw Cover Strips.
Step 4: Fitting a Replacement Herzim Trim
Replacing the Herzim trim is a relatively straight forward process. If you have not already removed your old trim, locate the end and gently pry it out of the track. Pull on the length to remove it from the channel.
Before fitting the new strip, it is important to clean the track to ensure it is free from any dirt or debris. Whilst the screw cover strip is removed, you may also wish to take this opportunity to thoroughly clean the section using a metal cleaner.
As these products are manufactured from a flexible PVC compound, you will need to soften the material prior to installation. This will make it significantly easier to fit into the aluminium track. You can do this by placing the coil in a bucket of warm water or by leaving it in the sun.
Once softened, take the end and pinch it into the opening in the aluminium track. Being careful not to stretch the section, keep squeezing the trim along its entire length all the way down the channel.
This material can be unintentionally stretched during the installation process. To minimise the chance of gaps forming at the end of the aluminium track, it is advisable to leave approximately 100mm of strip hanging out of each end of the channel. Allow a few days for the section to shrink back to its original length and then trim any excess.
Replace your Herzim Trim with Seals Direct
If you’re looking for screw cover strips, herzim trims or any other caravan sealing accessory our team at Seals Direct can help you find the right product for your requirements. We are a leading supplier of rubber seals and trims, with an inventory of over 760 stocked products.
Contact our technical team by email at sales@sealsplusdirect.co.uk or via phone on 01425 617722 for help and advice with selecting the best product for your caravan, motorhome or boat.