Archive for May, 2011

How to put a disposal in an ADA sink

Saturday, May 7th, 2011

I have had a few people ask if you can insall a disposal at a sink that is meant to be accessible with a forward approach.  For a sink to be able to have a disposal and a knee space, a few things will need to be understood.

In the 1991 ADAAG Figure 31 shows the knee and toe clearances that is required under a sink:

The dimensions for the knees should be 27” a.f.f. and 8” horizontally from the edge of the counter.  The dimensions for the toes are a bit harder to figure out.  They are 9” a.f.f. minimum and 6” maximum from the edge of the protective panel or pipes back.  This figure shows a wall, and most designers have a detail which makes the protective panel  is located 6” max. away from the wall.  This is not what it is trying to explain.  This is not technically incorrect but it does make it difficult to install a disposal behind the protective panel. 

 The 2010 Accessibility Standards separates the two dimensions and makes it clearer what clearances are required.  As you can tell, the 6″ that it is dimensioning is not going to the wall.  As a matter of fact, we don’t really care where the wall is.  All we are concerned with is the clear floor space designated or allowed to be used by the toes (in the front of the counter).  Toes can only go 6″ beyond the panel maximum.  That is what it is trying to say.  So if you are designing the clear floor space for a room you cannot use any more than 6″ max beyond the panel for the toes.  



If you use the dimensions the way it is shown in the current ADA, then a disposer that has a diameter of 12”, should fit if the proper clearances are provided. 


Some that we found that have small profiles are In Sink-E-rator.  But there should be others with small profiles.




Are your doors accessible?

Thursday, May 5th, 2011

 Doors are one of the main elements that will make a space accessible or not.  If the interior space is accessible, but the door is too narrow, or a person can’t open the door and use the hardware, then the space cannot be really accessible.

In the 2010 ADA Accessible Standards, doorway requirements are found on Section 404 Doors, Doorways and Gates (Page 217 of The ADA Companion Guide).  Some scoping requirements are also found in Section 206.5 Doors, Doorways and Gates.  In summary, here are the technical requirements for doors:

  1. Revolving doors should not be part of the accessible route.  That means that you need a swing door alongside it if you want to use a revolving door.


2.  Double leaf doors should have one active door at 32” (unless a power assisted door with stand-by power is used, then the entire width of both leaves are counted together) 

3. Clear widths are 32”.  Hardware can decrease the width by 4” if mounted between 34” and 80” high (except closers that can be mounted 78” a.f.f.).  If you have an existing door that is 34″ wide (and then the width of the door makes the clear opening less than 32″, then add fully overlay hinges and it will make the clear opening exactly 34″.


4. Maneuvering clearances follow figure 404.2.4

5. Recessed doors are allowed but only 8” max. of recess

6. Ground surface at door maneuvering clearances should be no steeper than 2%

7. Thresholds at doorways shall not exceed 1/2″

8. Door hardware hall have a shape that is easy to grasp with one hand and does not require tight grasping, tight pinching, or twisting of the wrist to operate.


9. Door hardware should be mounted no higher than 48” a.f.f. except in secured areas like pool gates where you can mount up to 54” a.f.f.

10. If a door has a door closer, then the sweep period of the closer shall be adjusted so that from an open position of 90 degrees the door will take at least 5 seconds (changed from 3 seconds) to move to a point 12 degrees from the latch, measured to the leading edge of the door.

11. Interior and sliding or folding doors must have a maximum force of 5 lbs.

12. From 0”-10” above the ground should have a smooth surface


13. Vision lights should be mounted 43” a.f.f. max to the bottom

14. Automatic and power-assisted doors shall be on a stand by power for it to be used instead of the maneuvering requirements listed above

 Operating door hardware

Sliding doors are a great way to save space and still have privacy.  In an accessible design, the hardware becomes the most problematic.  There are some hardware that will make the width narrower than 32” wide, and sometimes the pocket type sliding doors have the type of hardware that requires the use of the hands by twisting, pulling or pinching the hardware in order to use it.  See this video on how most hardware works

Below are some hardware that are not  good for accessibility.  The recessed handle  could work if the gap is wider than a fist.  In other words, person who does not have good use of their fingers (like people with rheumatoid arthritis, or cerebral palsy) would only have the use of a closed fist to operate this door.  So the gap will have to be wide enough to allow them to use it.

The hardware on this door will allow for a person to use their fist inside the loop, but to design the opening, the designer  will have to take into account the door handle.  A 32” wide door will not work since the door handle will make the opening narrower.

The hardware shown on this photo can be lifted with a closed fist and it is narrow enough where the door opening will not narrow as  much once the pocket door is recessed.

Automatic doors

Power assisted doors are very useful if the maneuvering clearances at doors and the door hardware is such that does not allow independent use by disabled people.  If there are existing doors that do not have the proper width, proper maneuvering clearances or proper hardware, then a power assisted door will be useful since their automatic type mechanism will open the door for the person who can’t open it on their own.  But in the 2010 Standards, the only way to not require the maneuvering clearances shown on Table 404.2.4.1 is to use a power assisted door with stand by power.  Then the landing requirements, push and pull side clearances and even widths at double leaf doors will not be required.