Are low threshold bifold doors weatherproof

Photo of author

Nick Dardalis

Updated on

Are low threshold Is a low threshold bifold doors weatherproof? Depending on the product and the installation, the answer is yes. Low threshold bifold doors are weatherproof.

The type of threshold you get also depends on the brand you buy, as some bifolding doors come with more threshold options than others.

Should you have low threshold bifold doors?

low threshold bifold doors using a warmcore product in new extension

The advantage of having low threshold bifold doors is how much better they look when open. with flush interior flooring or carpets, the flush threshold, and the outside decking or slabs, the overall effect just looks much better. Of course, there’s better accessibility as low threshold bifold doors have a reduced step-over too, compared with a standard threshold. Work with your builder or architect and the track can even sit lower than the finished floor too with the right bifold.

Many bifold door brands only offer a standard or a flush threshold. And with many of these brands, the flush is marketed as for internal use only. Other bifold door brands come more options all with a different design, meeting more usage requirements and offering different levels of weather performance. You can even get low threshold bifold doors meeting accessibility requirements as part of Building Regulations covered by Document M.

All the different threshold options on a well-designed folding door provide not only a choice for the end-user but also make a bifolding door suitable for a variety of property types and installations.

Which low threshold bifold doors are weatherproof

If you’re buying a bifold door with only a couple of threshold options, then it’s how you fit the doors that determine how weatherproof the threshold. This involves setting an otherwise standard threshold or track lower but still giving you the weather protection from the build-in rebate most come with.

Where the brand offers a low threshold option, many will caveat this with where it should be used. Many of these are marketed without a weather rating and the responsibility is, therefore, all yours. You’ll read statements such as the low threshold option is only suitable for internal applications, with no warranty or where the door is unlikely to be at risk of driving wind and rain.

Low threshold bifold doors with a choice thresholds

The more advanced bifold door brands give you more choices for low thresholds. The uses of these are varied and diverse, so it’s not possible to explain all of these here. However, the better bifolds give you more options. Some will give you a low threshold with a weather rating without having to set the bifolds lower too.

aïr800 bifold doors

The great design behind air bifold doors made by Everglade Windows also provides flexible threshold solutions including low thresholds with a weather rating. These doors also come with luxury handles and a 25-year manufacturer guarantee.

Alumina bifold doors

The excellent Alumina bifold designed by Liniar, comes with a Document M approved ramp threshold with a weather rating.

Another benefit of Alumina bifolds is its classic styling, great design and its even available in a foiled woodgrain finish.

Reynaers bifold doors

Reynaers is another company offering a choice of low threshold bifold doors with the CF77 and CF68 models.

You’ll get a flat bottom model, one as a full low threshold, a double weather seal version and a high performance. And all of these can work as a flush design.

Solarlux bifold doors

The bifold door range by Solarlux typically comes with around five different options for getting a low threshold. These doors give you several options for how you want to design the track.

You get different levels of weather performance as well as the option for a ramp.

We recommend the Visofold bifold door by Smarts for its great price and wide availability, and you can get in touch for more information and where to buy it.

Schuco ASS70 low threshold bifold doors

The ASS70 contemporary bifold by Schuco is another product with a selection of threshold solutions for homes or commercial buildings.

Sunflex bifold doors

Made in Germany and another great bifold door brand is Sunflex that also comes with flexible threshold options depending on where you’re fitting these.

Visofold Bifold Doors

Smart Systems design their bifold doors very well. Because Visofold doors are widely used in homes, shops, offices and even garage showrooms, the company has tried to address most requirements with a range of threshold options and designs.

Find the best low threshold bifold doors

Remember, you’ll get weatherproof low threshold bifold doors with any good brand using their standard arrangement. But when you have a specific requirement then it’s worth checking out the threshold options of the upper-level folding sliding doors.

Wheelchair users, families with pushchairs or kid’s bikes, or those replacing dated bifolds and not building a new extension, could benefit from using a bifold door product with more options than the standard rebated or flush type.

Get in touch for more information about these and other bifold doors and where to buy.

Providing expert help to homeowners and trade professionals since 2010




Get Free help finding the right products from the best suppliers

16:42 30 Oct 23
Nick responded incredibly quickly to my enquiry (on a Saturday too!), and was able to offer invaluable advice on both aluminum systems and manufacturer / suppliers. Thanks Nick!
chris steerchris steer
16:18 09 Oct 23
Had a meeting with Nick during the grand designs show. Was extremely helpful and professional would highly recommend
Chris WesthorpChris Westhorp
19:55 13 Sep 23
Extremely helpful with pointing us in the right direction to find the products we required and suggesting firms that could reliably fit them.Nick was quick to reply and very detailed in his advice.Highly recommend reaching out to them.
Cathy GreenwoodCathy Greenwood
07:03 11 Sep 23
Update - A second email to nick for help on bifolds resulted in a detailed informative reply even on a Sunday ! This guy is so knowledgable and helpful .I approached Nick for an independent view on sliding doors v bifold and the different brand options . His reply was extremely detailed and prompt and allowed me to navigate this often confusing world in a much more informed way . Thanks so much Nick
Anthony CraigAnthony Craig
12:45 05 Sep 23
This is a must site for anyone looking for advice. Great service and very quick answers to questions. Nick has been of great help quiding us through the maze of aluminium products. Thank you
Philip DuffieldPhilip Duffield
20:24 26 Jul 23
I contacted Nick @ ATS for guidance on what aluminium sliding door systems would be suitable for an opening in an extension that is going to be both wide and tall. He came back really quickly with very detailed and incredibly helpful advice. He is clearly extremely knowledgeable about the systems on the market and their respective features and capabilities. If you’re feeling a bit lost by the overwhelming range of choices out there, I’d definitely recommend contacting him.
Dariush HekmatDariush Hekmat
17:25 19 Jul 23
Nick's advice is great. He is always quick to respond and spends time on responses, which really help to make an informed decision.
Alan FosterAlan Foster
07:51 12 Jul 23
Absolutely fantastic. Asked for advice about replacing Crittall (?) windows late last night and early this morning received 3 great suggestions and contact information for suppliers
Rachel LauRachel Lau
09:24 16 Jun 23
Fantastic website full of valuable and pragmatic advice about product selection and comparison: no other website gives information like this. Truly written for public interest. Don't hesistate to reach out to Nick via the mailing system. He responds very quickly, is friendly, and has very sound and high knowledgable advice. I have already shared this with my friend planning her own grand design.
guard Charlieguard Charlie
12:28 14 May 23
I emailed this company just on the off chance they could help me with new magnetic sliders for my patio door. They were not able to supply those but were so very helpful providing me with the name of a company who could. I am so very grateful at the great service. Dare say customers must be very happy. thank you so much.
Benjamin LewisBenjamin Lewis
10:06 04 May 23
Nick is very helpful indeed. Extremely knowledgeable on bifolds which was in relation to my query. Great website as well, some very useful articles. Particularly appreciated the article that lists all the major bifold options in order of their sightlines! Thank you!
P JonesP Jones
08:07 15 Apr 23
I asked Nick some questions about an installation we were considering and he replied within hours with some very useful suggestions that will probably lead us to using a different make and supplier. Thanks, Nick. Great work.
Nicholas WallNicholas Wall
13:18 02 Apr 23
Looking for fair and honest expert advice on all aspect of aluminium windows and doors? These guys will arm you with all the information you need to make the RIGHT choice in a highly complex, crowded marketplace. post a question and you will get a very quick professional answer you can rely on being based on fact. Thanks guys!
Giorgia SiriacoGiorgia Siriaco
16:25 21 Mar 23
After a lot of research to find doors that would meet our unusual size requirements and feeling increasingly uncertain about the best way to spend our small budget, I stumbled on the ATS website, and I'm so glad I did! I contacted ATS to request advice and Nick promptly replied with a wealth of information, providing us with options and relevant contact details. I only wish I'd found them sooner!
Carol NortonCarol Norton
10:01 17 Mar 23
I've been so confused about how to achieve the look I'm after, and going round in circles with various window/door companies, trying to get away from the huge chunks of plastic currently around my windows. I didn't expect an email to a company found through a Google search to really help - but I was desperate, so I tried. I'm SO glad I did. Finally I have clear explanations from ATS of where I've been going wrong, exactly what I'm looking for, and a list of local companies that might be able to provide it! The response has excelled my expectations and I feel as if I'm finally inching closer to a home with which I'll be happy and comfortable: thank you.
David NunnDavid Nunn
20:54 14 Mar 23
It is rare that I write reviews, however after my very positive communication with Nick - enquiring about suitable slim sash aluminium windows for my project, I felt that a review was definitely warranted. I can reinforce the many positive reviews posted so far, Nick was very quick to respond, providing comprehensive detail, with excellent independent advice.In summary, great service, thank you Nick.
Chantal AuerbachChantal Auerbach
13:04 09 Mar 23
Nick from Aluminium Trade Supply was incredibly helpful informative and pleasant to deal with. He responded quickly to emails and was very knowledgeable. Highly recommend being in touch with Nick if you are considering new aluminium windows or doors.
Lee JonesLee Jones
20:21 22 Feb 23
I dropped Nick at Aluminium Trade Supply an email re high security slim sightline bi-folds and their alternatives and he responded that quickly (and so comprehensively) that I felt bad I’d not paid him for his time!Nick Sir your product knowledge is outstanding and you are providing a level of service that goes wayyyy above and beyond expectations. I’ll definitely make sure I mention Aluminium Trade Supply to anyone I encounter looking for a fenestration solution 🙏🏼
15:13 13 Feb 23
We are looking to replace some old UPVC patios doors with aluminium ones. The ATS website is a great source of advice in an area where clear information is sorely lacking. Having used the website, I then followed this up with a number of specific questions relating to our search, and Nick came back very quickly with clear, detailed and very useful advice.I have been very impressed with both the website and with Nick's advice. My only regret is that I didn't come across ATS before replacing various windows in 2021 - I'm sure it would have saved me a lot of grief and money! Thanks again Nick.
Azza McCabeAzza McCabe
17:47 01 Feb 23
So impressed with this company.Responded to my query quickly andgave valuable advice. Nick was extremely helpful and we were able to move forward with our project.
Adri LoloçiAdri Loloçi
11:21 08 Jan 23
Nick was super fast to respond and provided some great recommendations. I would recommend this website to anyone looking to find bifold or sliding aluminium doors.
Stephen HoustonStephen Houston
16:16 03 Jan 23
Looking for aluminium crittall style internal door and external patio French doors. Noted good reviews and thought would ask for advice. Comprehensive reply with excellent independent advice and lists of fitters who could provide products and installation. Great service.
Inga GeachInga Geach
08:25 21 Dec 22
Nick from Aluminium Trade Supply has been extremely helpful with navigating the jungle that is aluminium glazing for our upcoming extension project. His advice was prompt, detailed and always impartial. Very grateful for your input, thanks Nick!
Amanda BurtonAmanda Burton
10:54 16 Dec 22
Brilliant website and an excellent service. Nick provided not only detailed advice and supplier contacts, but highlighted the considerations of various products so I could make an informed choice. Our Sunvista minimal sliders were fitted this week and I couldn't be happier, stunning. Thanks once again for your advice and recommendations, invaluable!
Keith BarnesKeith Barnes
17:18 10 Dec 22
Very helpful advice given to my question, including the name of 3 different companies that i could try for the product being enquired about. Many thanks
Munim ChowdhuryMunim Chowdhury
11:45 13 Sep 22
Nick has been very helpful on signposting me to a number of partner organisations for steel/aluminium doors.
SUSAN wallaceSUSAN wallace
17:26 31 Aug 22
My experience with this firm was exceptionally good and this is notalways the case as a female, dipping a toe into technical waters.I was spoken too with courtesy and at a level that helped me consolidate what was needed .On top of that I was given a list of companies and places where I could obtain the type of product I needed.I could not thank them enough and would certainly go there again and reccommend others do too.
Paul SalterPaul Salter
22:39 22 Aug 22
Contacting Aluminium Trade Supply is like contacting the Oracle direct. Advice is always comprehensive and balanced. On multiple occasions they have provided me with options that fully meet our objectives. Many thanks.
Nick McCormackNick McCormack
20:25 14 Aug 22
Really helpful and useful came back to me on a Sunday with some invaluable information. Highly recommended.
ray addisonray addison
13:14 14 Aug 22
received a prompt reply to my query,and helpful information from ATS