Marlin experts liaise with you at the concept and early planning stages so that every detail is accounted for to make sure that everything is fully considered and nothing is overlooked.
Marlin provides a free sample of the door system threshold profile for your planner and builder to work from.
By using the sample you will know exactly how to set the masonry at the correct height to support the threshold and achieve a low or flush appearance.
There’s nothing quite like having the actual threshold profile to work with.
Visit the Marlin showroom to see a demonstration of all the elements required to achieve a low or flush threshold - you will see exactly how to prepare for the very best outcome.
Our low profile superslim frame low threshold bi-fold doors featured on Love Your Home & Garden With Alan Titchmarsh (Swindon episode)
broadcast on ITV on January 15th 2019
Watch the programme highlights in less than 2 minutes below
"it's like a dream home"
"So easy to open"
"so slim and so elegant, barely any step we're talking millimetres"
Recently had large sliding doors fitted. Excellent customer service right from the initial visit to Marlin. Hannah was brilliant and so helpful.
Project was finished to a high standard and the fitters were first class and very professional. Would definitely recommend this company.
In order to achieve the desired threshold height it is vital to understand what the final levels will be on both sides of the door. The final floor finish level will dictate the masonry height on the external leaf of the building that is supporting the door.
Would highly recommend Marlin windows. Installed bifold doors with meticulous planning and precision. Had a tour of the showroom and assisted through the purchase and installation process ensuring perfect fit of clearly an excellent aluminium product. Can’t recommend enough! Have recommended to others and our builder said they were the best supplier and fitter they had ever used.
As explained above, a small threshold upstand is advised to accommodate small level inaccuracies but is also vital for open in bi fold doors to ensure that the panels will fully open.
Looking out on an open in bifold door low threshold
Looking in on an open in bifold door low threshold
Looking out on an open in bifold door low threshold with cill
Looking in on an open in bifold door low threshold with cill
This is very important for a number of operational reasons:
Allowing clearance under the panels is not usually necessary since most external levels finish lower than the drainage outlet on the outside face of the threshold.
Looking out on open out bifold door low threshold
Looking in on an open out bifold door low threshold
Looking out on an open out bifold door low threshold with cill
Looking in on an open out bifold door low threshold with cill
However, when using a rebated threshold some design requirements indicate a minimum step between inside and outside. To achieve this, the external finish would then approach the threshold above the drainage outlet and so for this detail the same panel clearance rule will apply as for open in bi fold doors.
Read our guide to buying bi-folding doors for your home
All bi-fold doors can be fitted with built in integral blinds
Read our guide to buying sliding patio doors for your home
All sliding doors can be fitted with built in integral blinds
The door framework is designed to drain water. It is vital that the drainage holes on the outside face of the threshold are not blocked by masonry, steps, paving flags or decking etc.
For materials that are close to or touching the threshold above the drainage outlet on an installation at ground level, make sure that adequate land drainage is in place. This can be a simple channel filled with a coarse aggregate or an ACO type drain - installed with careful planning this can be discretely hidden under external finishes.
For an installation onto a balcony area, make sure that an adequate drainage system is in place under any external materials that are close to or touching the threshold above the drainage outlet.
Sliding Door Drainage Open In
Sliding Door Drainage Open Out
Sliding Door Drainage Cill Open In
Sliding Door Drainage Cill Open Out
Marlin provides threshold profile samples to help with construction details and surveying decisions.
This is a free service for all orders and can be invaluable in helping to clearly understand the relationship between the masonry that supports the threshold and the final floor finish.
At the start of the project the builder needs to know the following important information:
The door system and design
Panel opening configuration
The target height for the threshold
The builder will create the new opening and lay masonry to support the threshold. The height and level accuracy of the masonry will dictate the height of the threshold in relation to the final floor finish.
With the final floor finish known and the threshold profile sample on site you can be confident in achieving the required threshold detail.
It is possible that the existing floor structure will need to be modified in order to accommodate the depth of the threshold profile.
This is usually the case for deep three and four track sliding door frames but can apply to other frames depending on the desired position of the frame within the building fabric.
Had all our windows replaced with aluminum including 2 sets of bi-folds. It took a number of visits to the factory to meet with Adrian and Hannah who were both very patient and helped us choose the correct lay out and colour. Very pleased with the result... Highly recommended.