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joists
A joist is a horizontal structural member used in framing to span an open space, often between beams that subsequently transfer loads to vertical members. When incorporated into a floor framing system, joists serve to provide stiffness to the subfloor sheathing, allowing it to function as a horizontal diaphragm. Joists are often doubled or tripled, placed side by side, where conditions warrant, such as where wall partitions require support.
Joists are either made of wood, engineered wood, or steel, each of which have unique characteristics. Typically, wood joists have the cross section of a plank with the longer faces positioned vertically. However, engineered wood joists may have a cross section resembling the Roman capital letter "I"; these joists are referred to as I-joists. Steel joists can take on various shapes, resembling the Roman capital letters "C", "I", "L" and "S".
Wood joists were also used in old-style timber framing. The invention of the circular saw for use in modern sawmills has made it possible to fabricate wood joists as dimensional lumber.
I am being asked to tile a screeded floor which has joists inset into the screed and which are flush with the screed. Does anyone know of a system that can be overlaid before tiling. My concern is that these timbers will expand and crack the floor. The stone is 500mm x random limestone...
if you were to tile an upstairs bathroom floor that was bad ply or rotting floor boards, or another instance of wanting to overboard but due to a height issue it would be better to rip out existing floor and re-board on top of joists... I've been thinking recently about how you would go about...
hi all, i have a job to look at for a customer who is getting conflicting advice from the ufh installers and the joiners
the ufh installers are putting in an inbetween joist system of some sort and are advising screwing 22mm ply to the joists as an overlay and tile direct
the joiners are...
Guys, I have a job on at the moment and the client wants to have the upstairs tiled out. The house is pre 1900 and the joists I've replaced in the ceiling don't bode to well for the floor being to good when we start boarding out. The customer is a big chap and I have serious concerns that the...
Hi, I am redoing my upstairs bathroom and would like to use tiles for the floor (total tiling area approx 4 sq Metres). I will be replacing the 18mm plain chipboard!!! the original builder used, with 18mm WBP Ply - suitably sealed and with additional noggins on any unsupported joins. I know 25mm...
Time and time again, I see advice offered to check for deflection before starting to tile on floorboards/plywood across joists.
What I don't understand is - how do you check for deflection and how much deflection is acceptable? Is there a gadget or a certain way of doing it? Do you jump up and...
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Thanks to all who gave advice on my 1st thread yesterday.
Please bare with me as I am having a blond moment, and thats hard for someone with as little hair as I have.:lol:
As mentioned yesterday, I am renovating my bathroom and am planning to remove the current varnished t&g flooring and...
Hi
I am in the process of renovating my bathroom and turning it into shower room with a wet room area.
I am going to use a preformed shower tray such as a Tuff2 tray to cover the showering area with wood sheeting covering the remaining floor area. Currently the floor is covered with varnished...
Guys Im redoing a bathroom floor as the tiles that were down were coming up on there own, turned out it had been tiled straight onto the floorboards by the previous tiler. I told the client that the floorboards needed to come up as most of them were water damaged and twisted, so now I have bare...
Hi,
I am removing floorboards in my bathroom and replacing them with 25mm wbp plywood which i will be tiling on. I know I need to screw the plywood down every 150mm with countersunk screws. What screws would you advise I use? As I will be screwing into the joists I am not sure what length screws...
Hello everyone just a quick question. I have the opportunity of laying ply down on straight onto joists in an upstairs bedroom in preperation for tiling . Now I know that probably 25 mm ply would be the best option to gor (or at least this is what I have been led to believe), however are her...
I've done few bathroom jobs in the tiling world now, and have come across problems when taking old floor boards up in old houses esp in bathrooms. When I lay and screw down the ply ready for tiling it always tends to bow down in the middle or wherever the main traffic area is.
I always tend to...
Our fitter has covered a bathroom floor that has existing floorboards, with 9mm ply and tiled using porcelain tiles 300mm x 300mm with flexible adhesive. A bulge has appeared in the floor from the door to the outside wall but the rest of the floor is completly flat. He is worried that it is...
Hi there I have started tiling onto chipboard and I'm using dunlop flexible set fast plus with flexable additive for added flexablity. Now I have tested most of the floor for movement and the client has hired a joiner to take care of the major parts with too much movement.
There is an overall...
Hi Guys
Startd a job today, bathroom floor, has had some leakage in the past. Ripped the carpet up to find chipboard laid on top of the joists.
Walking round on this produces a nice squeaking sound, and jumping up and down on it makes the whole floor move.
I advised the customer that it...
Hi guys, just a quickie. I'm tiling my brothers bathroom this weekend - in his bathroom he has the ceiling joists exposed and wants me to tile round them right up to the ceiling. I was thinking it would look better if the tiles finished a couple of inches below the joists with trim on top and...
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