Van Conversion Floor Framework Install

We start to install our van floor by laying the floor framework down to prepare for insulation and our van plywood floor.
Van Conversion Floor Framework Install

Starting with the horizontals are the best since the van is over 4m long, and we organised them so that the beams will be under where our furniture is going, so we can secure them to the beams. It took hours of measuring and testing, although I must say a hand saw would have made it take at least 3x longer.


Since we are putting down the floor, we have to put our moisture barrier over our wheel arches. Otherwise, we’ll never be able to reach them after.

We measured and sliced up our Reflectix (bubblewrap covered in foil) and coated the wheel arches, securing it down with aluminium foil tape around all the edges to give a secure seal.

van conversion floor framing


Laying down your floor beams strategically is a wise thing to do, as it allows you to screw your furniture into your beams later on in your build. ✏️

Hence, knowing your layout at this point is a good idea… (although through the build it will probably change around a billion times so don’t worry too much about it).

We planned for 10 widthways beams, roughly evenly spaced, but with a greater concentration in high traffic/furniture areas.

van conversion floor framing

top tip

We took care to not leave too large gaps between each widthways beam or the load bearing of the floor would have been uneven, which could result in squeeks, bendy floor, or even cracks.

van conversion floor framing


We bought 25x38mm wooden battens because the PIR Insulation board we are installing is 25mm thick, so the beams and the board will be the same thickness and give an even floor.

van conversion floor framing


By pre-planning your beam grid, you can buy the right number of beams and then measure and mark the wood to be cut with the least waste material at the end. 📏

We marked out our widthways beams first since we knew our pre-plan will have a noticeable margin of error, so we decided to do the lengthways cuts after the widthways beams have their final position confirmed. 

Cause you know, we’re bound to mess it up at some point, so just taking it slow. 😅

van conversion floor framing


Mitre Saw is by far the best investment for this job – it was only £50 well worth the purchase.

Not only does it cut true and straight, but it takes around 2 seconds to cut a beam.

A job that would have taken an hour by hand took us 5 minutes by mitre saw.

It was awesome! POWER! 💥


After the widthways beams were cut, we arranged them in the van and adjusted them so they fit.

Make sure to double check the 25mm side is the height of the beam (otherwise, you’ll end up with a bumpy floor).

We then measured and cut the lengthways beams. These were dependent on the distance between the widthways ones, and took a lot of cuts but we got them all fitting snugly.

Remember to take into account the thickness of the beams (in our case 38mm) when measuring the lengthways beams. Otherwise, you’ll end up with inconsistencies.

Best to do the measurements in the van with the widthways beams in place.

van conversion floor framing
van conversion floor framing

top tip

Our van floor wasn’t flat, it had natural bumps in it to dampen road noise. We positioned our blue beams to rest on top of these ridges to allow airflow underneath the insulation (since the PIR board will also rest on top of these ridges). 

It also means that if you get a water leak (like we did), the water travels down the gaps to the back of your van instead of creating a soggy mouldy mess.


Once everything was cut, we stuck it down with Sikaflex EBT+ and put tiles on top to weigh the beams down so it could stick properly (the beams had a tendency to spring up since y’know, it’s wood, and it’s winter). 

The Sikeflex EBT+ worked really well. It dried flexible, allowing for the beams to flex as you’re driving but without coming loose. 💪

Some people screw their beams to the floor instead of sealant (or in conjunction), but any holes = more chance for rust, so we didn’t. The sealant is strong enough.

But by all means, screw them down if you wish. Just waterproof and rust protect the holes really well (and try not to pierce anything really important underneath the van).

van conversion floor framing
van conversion floor framing

top tip

A 300ml tube should be enough for the whole floor – we were a bit over enthusiastic and ran out on the final beam.

We tested Pinkgrip but later found it to be rather weak and useless for this structural job, so we used another sikaflex sealant instead.

Use a good, flexible adhesive sealant, not a cheap one.

van conversion floor framing
van conversion floor framing
van conversion floor framing
van conversion floor framing
van conversion floor framing

quick look

  1. Plan beam locations
  2. Mark and cut widthways beams
  3. Mark and cut lengthways beams
  4. Adjust any lengths if needed
  5. Stick beams to floor


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