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Flush thresholds on patio doors

A low or flush threshold on patio doors is a desirable feature whether you’re looking at replacing your old patio doors or choosing the best doors for a new extension. In this article, we explain the various options for getting that desired look and feel with a low or flush threshold.

flush threshold on patio doors

Getting the perfect flush threshold on patio doors

First of all, it’s worth knowing that the standard threshold on our frameless slide and stack doors is just 5mm when sunk into the floor. It’s less than most other aluminium bifolding or sliding doors on the market. Many of these start at 15mm tall. There are even system where the low threshold version is only suitable for internal use.

Our advanced, highly secure, energy efficient and fully weathered doors we’ve designed to give you the best patio door solution in your home. The threshold on our doors we think is one of the best and certainly one of the lowest.

But it’s also fully weathered and wheelchair friendly. Therefore our patented frameless glass doors give you the neat and consistent sightline. And they come with the smooth transition to your patio area or garden. Of course, our own design gives you the flush look and the ability to have your internal flooring matching up with your decking or slabs on the outside.

How patio doors tracks and thresholds work

With most door brands and systems the track or threshold offers a standard installation solution or one where it’s set into the floor for a lower line. Correctly fitted, it not only creates the desired flush look but also ensures your doors remain weathertight when closed.

A good set of doors provide all the weather protection you need and the design also allows effective drainage of water to the outside. Most of our customers choose our frameless doors for their new extension. This is where we at FGC work with you, your builder or architect early on in the planning and design stage.

If you’ve yet to build your new extension, plan early. When all parties involved in your project work together, mistakes and delays are avoided. We provide your builder with either drawings, information or even a sample of the track. Knowing the makeup of our doors before they arrive lets your builder create the correct opening.

Why drainage is important on patio door thresholds

How water drains to the outside is one of the crucial design features when planning a flush threshold on patio doors. On a standard installation, the doors sit on a cill. As the rainwater runs down the glass and frame, it lands on the cill. The projecting nature of a good cill deflects the water away from the doors.

On a low or flush version, it’s often the case your builder creates a suitable drainage area at the front of the doors. Again we frequently work with builders providing useful details of how our doors drain and what needs doing with the structure and exterior area in front of the door track.

In order to get the best result and no risk of leaking, drainage planning is essential. This also helps you and your builder understand the relationship of inside and outside flooring and their relationship to the threshold on your patio doors.

You’ll benefit from excellent weather performance, sealing the door at the critical flush threshold and all around the doors too.

Tips and Advice for getting the ideal patio door flush threshold

  • For new extensions, plan early and before work starts building the door openings.
  • Ensure you and your builder have an understanding of the door track. Every door is different and there’s no one size fits all approach.
  • Remember, bifolding and sliding doors don’t have the same design at the bottom track.
  • Do get to see your chosen doors fitted. It’s the best way to understand how to get the look you want.
  • Make sure your various trades are aware of the inside and outside finished floor sizes and dimensions.
  • The bigger the door opening, the more challenging for this to be 100% level and square.
white patio doors with flush threshold

Let our transformational glass doors create the perfect modern room

Whether you choose our standard doors or even an open corner design, our doors promise a stunning new room with that smooth garden access thanks to our super low threshold.

We’ve also got a great section with all the common questions about our unique product. Or why not get in touch and discuss your property improvement project with us. At FGC our doors give you the perfect exterior patio door. You can even use them inside the home as stylish room dividers too.

FINANCE OPTIONS AVAILABLE

Reviews on Facebook and Google

Frameless Glass Curtains have few competitors so they could take a lacked approach to their work. However, that is not the case. We have had a porch installed in a space that was not square or aligned. The service from survey to finish has been above standard. Barry’s attention to detail and determination that the work would not be complete until his high standards were met was much appreciated. The communication from the admin side was clear and helpful. So all in all we will be using Frameless Glass again and have no hesitation in recommending them.
D J
D J
14:43 14 Apr 22
Highly competent office and site staff, great product and at a fair price. Couldn't be happier with the entire experience and end result.
paul R.
paul R.
17:07 29 Mar 22
From the beginning to the end, everyone at FGC have been amazing. I knew straight away that the glazing FGC would provide and install would be spectacular and how right that was! The FGC glazing allows our Edwardian stained glass door to still be a main feature and in fact it shows it off perfectly. We are so happy with the end result and can’t praise FGC highly enough, somehow 5 stars doesn’t seem to be high enough.
vanessa C.
vanessa C.
20:41 14 Mar 22
Their windows are second to none. No other company in Germany, UK or anywhere else can produce such a fabulous product.Any issues that has come up, they always come & fix it. The staff are so nice and polite. For a small company they do really a great job over all. The main things are the frameless bifolds that you hardly have any frame in the line of vision and there is a 5 years guarantee. Mr & Mrs Jahedi
Zorè
Zorè
15:13 09 Mar 22
Delighted with our new frameless glass doors. Had lots of lovely comments, even all the trades who have been working on our house have said they've not seen anything like them. Great having something a little unusual. The quality of the doors is of a very high standard. The service from FGC has been very good too, from ordering through to installation. All went very smoothly with no problems. Paid a bit more than regular bifolds, but worth every penny. Best decision, no regrets at all.
Fiona G.
Fiona G.
15:57 06 Feb 22
Very happy with our installation
Jayne N.
Jayne N.
17:36 03 Feb 22
Great service and very welcoming for my father and I. Adrian in particular was very efficient, gave great pertinent advice and guidance on my future purchase!
Andrew H.
Andrew H.
21:45 17 Jan 22
Excellent in all aspects from initial viewing in showroom to actual installation.
Des P.
Des P.
09:21 22 Dec 21
Excellent service and product from FGC.I have a glass-box conservatory, built with structural glass about 20 years ago. The 2 sliding doors needed replacing, along with 2 side panels, and I contacted dozens of companies selling conservatory doors and none of them were prepared to install their doors because of the perceived risks of working with structural glass.Then I found FGC who, with no fuss at all, carried out a survey, provided a very reasonable quote for the doors/panels and then installed the doors/panels on the agreed date.Communication with the FGC office was always quick and easy. The surveyor and installation team were efficient and courteous. The product works beautifully.We can now use our conservatory again. Thanks FGC.
Tony
Tony
08:03 09 Nov 21
Great company with excellent, friendly and responsive service, the guys were helpful and efficient with the installation and the slide and turn doors are a fantastic product.
Arun S.
Arun S.
16:52 23 Oct 21
Excellent service from start to finish, from sales/admin to site survey to installation. Good communication throughout, very friendly staff and the Frameless Glass Curtains are a serious piece of kit. Quality materials, unique design and look stunning. Thoroughly recommended.
Roger H.
Roger H.
07:56 12 Aug 21
Fantastic service from start to finish, from the surveying, contact with office to the workmen. I have experience through work of a number of companies providing similar products and these guys have been by far the best to deal with
Matt G.
Matt G.
14:12 10 Jun 21
FGC installed a two-panel frameless glass door at our property yesterday. Wow!! the installation is exactly as discussed, and was carried out by two of FGC's team members who were so professional and courteous. They were excellent, and we have no hesitation in recommending FGC and their team to anyone considering such an installation.We are delighted with the installation, and very pleased we chose FGC.Well done FGC!!
David W H.
David W H.
07:31 10 Jun 21
The quality of the windows / doors are second to none.The customer service was first class from placing the order to installation we were kept informed at every step.The installation team led by Richard left our house and patio cleaner than when they arrivedI would recommend FGC 100%Tony- Burnley
Border S.
Border S.
16:19 28 May 21
From start to finish everything was excellent.Fab u lasThank you
Stephen H.
Stephen H.
20:09 27 May 21
BRILLIANT SERVICE FROM START TO FINISHHighly recommended.
Stephen O.
Stephen O.
09:01 21 May 21
We purchased a beautiful Origin sliding door and side window from FGC. FGC installed the sliding door and window on time, however the sliding door did not fit correctly. Issues can happen. FGC made the process of re-surveying and re-installation very simple. FGC is a very pleasant and professional company to deal with. We are very happy with their service and would strongly recommend them.
Nathan P.
Nathan P.
17:45 20 May 21
I love my doors! It’s transformed my place. The people are great, no nonsense, organised and efficient. I’d recommend them to anyone
Darius C.
Darius C.
12:29 05 May 21
Excellent planning and product advice. All the staff were polite courteous and friendly.On the day of the installation, the team arrived bang on time -we live in Wales so a long drive from Kent! They had the job done by lunchtime (fitting a sliding patio door) and I have to say that on first impression of the unit, it looks and feels like solid quality.
Adrian W.
Adrian W.
12:15 13 Apr 21
We had a 5m stretch of these wonderful doors installed several years ago and have been very happy with the uninterrupted view of the garden that they allow from the living room. They are admired by every tradesman who sees them. A minor problem we experienced with water ingress last year was promptly and effectively resolved, and the doors were serviced for free at the same time.
Ian J.
Ian J.
15:06 26 Feb 21
Great staff and great products! Have visited the showroom to view doors, really loved all of them! Have referred to a friend - Can't recommend enough
Elly B
Elly B
14:53 22 Sep 20
Really great doors. Really are something different. Expensive, but you really pay for what you get here.
Adam F.
Adam F.
12:56 10 Aug 19
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What our customers say

Chartered Building Surveyor I was impressed with the installers

I would like to reiterate that we are very pleased with our new FGC doors. As a Chartered Building Surveyor I was impressed with the installers who were careful, methodical and very professional my wife who is most particular was also very impressed with their cleanliness. I am sure we will get many years of

An underestimated product

After visiting a NT stately home which had a glass porch entry I asked fgc to see if they could do one for us. I had the vestiges of a porch with brick sides but no front. The installation made the entrance a feature which is declared up market and interesting. It is a halfway

Professor Eaton
Professor

Excellent windows!!!!

We have patio doors and a large matching picture window, these are well designed, manufactured and installed and are noticed and acknowledged by all visitors to our house. The customer service is also excellent so highly recommend these products and company.

Phillip Coutts
Phil

City View Projects, Battersea

As to how we were from initial contact (were we polite)? Extremely polite & very helpful. Arranging installation (were we on time and on schedule) Excellent, on time & schedule. Were we clean and tidy? Yes. And finally are you pleased with our doors (would you Recommend us)? My next design & build project I

Recent maintenance visit

FGC came to carry out some minor maintenance and as always they were very efficient and friendly. During this period of social distancing, they were well prepared and able to do the work safely and professionally.

David Paterson
David

Porch Door

we are very pleased with our new porch door which enhances the look of our Victorian house. Very professional job from beginning to end with a great deal of trouble taken to get the measurements exactly right.

Philip N Brown
Phil & deborah

Very Pleased with the Freedom the Installation affords

We are very pleased with the freedom the installation affords us with easy access from lounge to dining room. Aesthetically the glass curtain installation is very pleasing. All appears well but we must point out the bottom bar is not firmly fixed in the channel in the floor & moves if one stands upon it.

Professional and Efficient

We had FGC doors and windows installed in our house in May 2019. From our initial enquiry through to installation everything was handled very professionally and with attention to detail. The doors and windows themselves are excellent quality and definitely enhance the house. The fitters who carried out the original installation were very good and

Geoff Radford
Geoff

Delighted with the transformation

The Glass Curtains are all that you promised….and are much admired. We are delighted with the transformation to the dining area now that the decoration is complete. Will forward cheque by post tomorrow( Friday)  and some pictures by E . Don’t hesitate to use us as a satisfied customer!

A rare thing

Serrvice. Good, old-fashioned service. Your team turned up a day early. And were courteous , efficient and helpful. That doesn’t happen too often nowadays.

Mr S
Mrs S. Bucks

bringing the outside in!

as an Architectural Technologists, I stumbled across FGC and its proved to be my best stumble. I have knocked two rooms into one to make the most of viewing my garden, my wife and I were looking for the most unobtrusive bi fold door frame to maximise the view, which was proving a challenge until

Anthony Mackin
Anthony

Delighted

Delighted with final result and extremely pleased that I decided on these ‘frameless glass doors’ over conventional bifolds. The company had no end of patience with any pre-order questions that I raised and the factory visit and visit to view an existing installation were very informative and reassuring. The team that fitted were professional, attentive

Linda Trodd
Mrs T

Published on January 2, 2021

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