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22 April 2012 - 1 years ,10 months , 17 days ago
Why you might need a low threshold?
There are many reasons why this is an essential option such as wheel chair access, the elderly and those with mobility problems, as well as making it easer for getting the pram over the threshold and for young toddlers. And of course anyone who would prefer not having a step on the way in or an extra obstacle to trip over!
The technical on thresholds
A standard upvc, composite or french door would have a upvc threshold and this would typically be a step of around 70mm. This is simply the bottom piece of a four sided frame, so the frame would be exactly the same on the bottom as it is on the top and sides. So to have a low threshold the bottom piece of frame would be replaced, in order to lower the step into your home the frame would be replace with an aluminium strip, which would be around 12mm in height. This option is available on upvc doors and composite doors, as well as french doors, however with sliding patio doors the operation is different, and the option is more limited. This is because of the sliding roller mechanism at the bottom. This is also the case with bi-folding sliding doors.
Your probable thinking "why wouldn't I want this option" well there is one another thing to take into account and unfortunately, it is a (small) down side to the option! For example a low threshold fitted to a composite front door would (but only slightly) reduce the energy efficiently. This is because in order to make a seal against the aluminium strip there are two rubber seals and whilst these are 100% weather tight, there is not the insulation properties of a standard threshold.