How far a rigid vinyl floor runs before a transition strip is required

A maximum run is the one specification on this site that decides the shape of a room. It is also published on page three of a document nobody reads before buying, in a unit the next manufacturer does not use.

A floating floor expands, and the installation instructions deal with that in two places: the gap left around the edge of the room, and the distance the field may run before the movement has to be broken by a transition. Not every maker publishes both. Below a declared limit, an open-plan floor is one continuous surface; above it, a threshold strip appears in the middle of a room, and the buyer meets it for the first time on the day the floor is laid.

The limit is not printed on the product page, the sample chip or the sell sheet. It lives in the installation instructions, and it is the single figure most likely to change what a room looks like after the material has already been paid for.

14 of the 16 products on this site declare a maximum run before a transition strip is required, and two makers publish installation instructions that set no limit at all. That is a finding about the floor, not a gap in this table, and it is printed as one.

Among the makers that declare the limit as a length, the shortest run permitted is 40 feet and the longest is 80, with a third figure in between. The widest declared run is twice the narrowest. Those are not variations on one number. They are the difference between a great room that can be laid in one piece and the same room cut by a threshold strip a reader did not expect to see.

Two products in this release are not declared as a length at all. COREtec publishes a maximum area of 2,500 square feet, and an area becomes a run only under an assumption about the shape of the room. The assumption is made in the open here: a square field of that area has a side of about 50 feet, and the converted figure is published beside the declared one with the assumption attached. Nowhere on this site is a square-foot limit compared with a linear-foot limit as though they were the same measurement.

Four products attach a condition to the number, and in every case the condition narrows it. The conditions are printed in the table below, beside the figures they qualify, because a maximum run quoted without the sentence that shrinks it is the shape of the fact with the meaning removed.

The limit is a judgement each maker makes about its own core, its own joint and its own tolerance for a warranty claim. There is no product standard that fixes it, and no test that produces it: it is a number the manufacturer chose, published under its own name, and stands behind. That is exactly why it varies, and exactly why it is worth reading. A maker willing to permit a longer unbroken field is telling you something about what it believes its joint will survive.

That freedom also means the figure cannot be checked against anything. A slip figure has a method behind it and an abrasion result has a laboratory behind it. A maximum run has a decision behind it. What is reproduced here is the decision, with the document it was read from, and carries the condition the maker attached to it, and does not attempt to rank the numbers against one another as though they were measurements of the same thing.

This note does not tell you whether a floor will fail beyond its declared limit. Nobody publishes that, and nothing is tested here. What the limit governs is the warranty: a field laid past it is a field laid outside the installation instructions, and every warranty in this release excludes installation contrary to those instructions.

The perimeter gap is the other half of the same allowance, and it is the half that fails first: too small a gap is the usual cause of peaking in a floor laid correctly in every other respect, and skirting board over the edge does not satisfy the requirement. Every product page prints the gap its maker declares, beside the run.

The limit also says nothing about a room that is not a simple rectangle. Doorways, L-shapes and long narrow halls are governed by the same instructions and usually by additional clauses about breaking at openings, which are read per product and published on each product page rather than summarized here.