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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

Quality company with quality product. Very happy with our new frameless folding doors.
Danny B.
Danny B.
10:39 14 Aug 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 H.
David 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
Fantastic product fitted by professional abs friendly staff.
Chrissie B.
Chrissie B.
17:07 05 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
The quality of the product and the care taken in design and fitting is excellent. Really pleased with the finish and the service throughout. Excellent value.
Ken K.
Ken K.
09:37 21 Apr 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
We love our new kitchen windows fitted by FGC - we particularly chose them for their slim frames. Their service has been excellent throughout, including on a recent maintenance item. We would highly recommend them.
Tica C.
Tica C.
13:21 13 Feb 21
Excellent product fitted by professional and friendly staff. Would absolutely recommend.
Bernadette C.
Bernadette C.
14:59 10 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
so pleased with the first class service we received from the first phone call to the installation I would highly recommend FGC !
Chris S.
Chris S.
15:47 12 Oct 17
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What our customers say

Excellent product and service

We have just had sliding doors fitted to a barn conversion and are delighted with the result. The ordering, measuring and supply all went very smoothly, very creditable given the present difficulties. The fitting team arrived exactly on time and did a very professional job with great attention to detail…and very nice chaps too. I

Paul Gregory
Paul

Thank you for a brilliant product

Thank you for a brilliant product I am so glad I chose FGC for my windows/doors everybody who sees them is so impressed by them but mostly my wife and myself!
Thanks again [and your team] Best regards
Brian 20160927

Highly Recommended

Excellent product. First class service. Good communication. Skilful, competent fitting team, clean & tidy. Wouldn’t hesitate to recommend FGC to anyone! We’re highly delighted with our frameless glass curtains!

Diane Ratcliff
Diane

A great installation

“Thank you again for a great installation, we are really enjoying the extra light.” I will be sending a load more images your way at some point today.

Mr T – Woking

Start to Finish

From that first phone I knew I had found the product and the company! We wanted an internal glass partition and a bespoke fit. It arrived on time to the exact specifications detailed and was fitted by genuinely helpful guys who want the product to look good and work well. All the staff at the

Craig Ives
Craig

Mrs L

It’s nearly a year since you installed our glass curtains. They have been really great, exceeding our expectations, particularly during the winter months when they were absolutely draught free. When they are fully open you really feel that the lounge is part of the garden, it all becomes one space. Many thanks, they were one

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

Looks fantastic!

I am really impressed with the finished product and service e provided by FGC.
I had an image in my mind of how I wanted the end result to look. The “invisible” glassing was the most difficult and important part to source.
FGC came through with flying colours, right from the initial contact,

David, Surrey

We are extremely pleased with the doors

The installation of our new doors was eagerly awaited and did not disappoint. The fitters arrived on time on the agreed installation date. All waste was removed and the installation area was left clean and tidy. The fitters demonstrated the use of the system including future self maintenance which was very useful. We are extremely

Mr & Mrs A @ Poole

Delighted with the new doors – they have exceeded our expectations. Customer service from initial contact to installation was excellent. Staff are professional, helpful and friendly. Would recommend.   We would like to be on your list of completed installations as viewing the doors at Weymouth was so helpful in making the decision to order

Summerfield

As to how we were from initial contact (were we polite)?
Initial emails were very prompt, informative and positive and yes polite. Keen to accommodate our visit to the workshop and everyone very friendly.
Arranging installation (were we on time and on schedule)
Installation ahead of schedule and were on time on

A sincere thank you to your installation team

We would like to say how pleased we are with our fabulous new FGC doors and conservatory.  We thought the transformation would be great, but it’s only once they’re in that we’ve been able to see the full glory of the design – and our view!  We’ve had all the making-good done now, taken off

Mr R

Published on January 2, 2021

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