SJ23 Tech Tip B13, (Updated 2004-12-14) Bob Schimmel


Cockpit Grate or "Cleanliness is Next to Godliness."

It is next to impossible to clean your shoes well enough for a pristine deck.  You'll know exactly what I'm talking about if you have to launch your dinghy from the beach, having walked over dirt or gravel to get to that beach.  A cockpit grate is the last defense to trap shoe dirt, although I have dipped my shoe soles in the lake many times before climbing aboard!  Cleanliness is one of those things I envy if you have a paved parking lot or are tied to a dock.  The cockpit grate doesn't work 100% but it is better than nothing.  Another advantage of a cockpit grate is improved traction when the boat is heeled at 200 in the rain!  Wow what an improvement over standing on the wet gel coat on the cockpit sole. 

As nice as a custom wood grate would be, I choose to buy interlocking vinyl matting because the price, colour, stiffness, thickness and drainage are perfect.  This product is sold under different names.  EnviroTile, manufactured in Canada by IPEX, advertise it as an anti-slip, anti-skid and anti-fatigue, shower mat.  Exactly the properties required on a sailboat.  Best of all, the manufacturer uses recycled vinyl.  Polymax makes the same grate in sheet which might be better in the cockpit.  Choose a light colour so your feet don't cook when the stuff is exposed to the hot sun.  My colour actually gets too hot after the sun beats on it all day.  While the mat is stiff enough to withstand 200 heel with one person bracing their feet, it is not quite stiff enough when the boat is heeled at 300 and beyond.  At this angle the mat tends to slide across the cockpit and buckle under my feet.  This is about the only disadvantage of this material.  I have learned to live with it but guest crews are sometimes surprised by the curl of mat under their feet.  A second crew will usually cause the mat to curl at 200.  But then an SJ23 shouldn't be heeled beyond 200 anyway! 

CONSTRUCTION - The cockpit of an SJ23 is tapered along its length which makes cutting a square "ready made" stiff vinyl mat somewhat difficult to fit.  In fact this is probably the best reason for making a custom grate from wood

Make a template from cardboard using the following dimensions:

  • Length - 57.5"

  • Width (front) - 23"

  • Width (rear) - 17.25"

It will ensure that you draw an accurate outline of the cockpit floor along the centre line of the vinyl mat.  It will also save you many trips up and down the ladder.

Cut the template so it fits snug to the cockpit walls to ensure the mat does not slide when the boat is heeled.  There is nothing more annoying than standing on a sliding slope.  Use a very sharp stubby blade or a band saw to cut the vinyl material, creating a sloped edge that allows for the turn of the cockpit floor through the thickness of the mat.  This way the top of the mat will lie snug against the wall creating a neat appearance.  Once the template fits, draw a heavy line down the center of it for aligning the vinyl mat along the centerline of the hull.  All corners are 1" radius.  Use a hole saw to drill a 2" diameter hole through the grate, centered over each cockpit drain. 

You may notice in the photo that the edges are stepped instead of smooth. This due to the shallow angle of the cockpit with respect to the straight lines in the mat.  While I tried to straighten the edges by filling the voids with sealant, in the end I gave up as the matting worked perfectly fine.  Not as neat looking as I would like but certainly simple and effective.  After sailing several seasons with this mat in the cockpit, I am still very happy with the performance and my cabin floor stays cleaner.  Now I just have to sweep up the sand under the mat or wash it to the cockpit drains!  It's amazing how much gets trapped there.  Cleaning the mat is accomplished with a quick dip in the lake.  I have never seen anything stick to it.


  1.  If you choose a sectional vinyl floor mat, make sure the sections lock together well so you don't loose one when you dip the whole assembly into the water for cleaning.  Another consideration is that the sections remain locked when standing on them with the boat heeled at 200 or more.  For this same reason, choose a mat that is stiff.

  2. If you make your own grate from wood (teak, cedar, red wood), remember to leave grooves underneath so water can run freely (sideways and aft) to the drain holes.  Cut your lap joints friction tight so no clamping is required as this would be an awkward project to clamp. 
    Use Gorilla Brand, polyurethane glue for the following reasons:
    - it is waterproof.
    - does not expand or contract over extreme temperatures (contains no plastic fillers).
    - easier to apply compared to two-part epoxy. (Epoxy would probably work but better to use it where it is really required?)

  3. Another material that is similar to wood is Trex.  Totally water proof. 

  4. Regardless of which material you use, don't cover the cockpit drain holes.  This restricts water flow and if your cockpit is swamped you will need all the drainage they can supply.  In the picture shown I have not yet cut the drain holes in the mat.

  5. Other uses for EnviroTile to keep stuff high and dry:
    - In the storage areas behind the settee backrests.  See Tech Tip C1.
    - In the anchor locker so the line dries between uses.  I hate smelly line.  See Tech Tip B11.

    - In the cockpit lockers to prevent mildew, Tech Tip B02
    When you clean a locker, use soapy water to contain bacteria spores.  You don't want to breathe these in.  Nasty stuff that can make you really sick.

  6. Remember to lift the cockpit grate and rinse once a month.


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