joist

I am raising my loft joists (100mm) by putting new joists (170mm) across the old ones (perpendicular?), I plan to add more insulation and board an area so I can store stuff up there. My question is: how should I fix the new joists in place? Do I screw them down from top to bottom, long screws...

Hi. I’m up to speed with cut roof construction from previous threads. Looking for advice/opinions on specific situation. Existing garage ceiling joists 47x100: 6m span on wall plates either end. 400 c-c over 3m run Existing binders 47x125: at 1.5m spacing perpendicular to joists. One end...

I am boarding some of my loft for storage and am a bit confused on the best way to strengthen the existing joists. I have read conflicting advice, some say you can add additional joists on top and perpendicular to the exsting ones. Others say do them parallel and some say increase the height of...

Hello everyone, I have been looking under the kitchen floor in the 1910 house we recently moved to using an endoscope, in order to check out joists etc as there was penetrating damp in two walls when we bought (have since taken steps to address this with additional airbricks, fixed guttering...

I have some floor boards in bathroom toward the end panel of the bath tub which have rotted including part of the joist. Access is restricted due to bath tub and there are pipes running directly below the main rotted floor board and perpendicular to the other adjacent floor boards which are...

Hello, For an exam assignment I have to calculate an entire construction in wood, for this I need to know what the weight (in kN/m³) of joists is. In my assignment I use I-joist of 90mm wide and 360mm high. I've already seen all kinds of things and all kinds of different numbers (in the...

Hi everyone. I'm hoping someone could give me a bit of advice. I want to create a small opening (no wider than a door's width) in the cellar's internal brick wall. The reason for this is because currently there is no access to the suspended floor below and I want to access it so that it's so...

Hi all, I am planning to build a garden room which will be 6.6 meters wide and 5 meters long/deep. I have managed to find joists that are 6 meters long which will give me the overhang on the front and back. The roof will then have firring strips on top, 18mm OSB board and then EPDM rubber on...

I'm trying to find the ceiling joists in my garage (which is integral, sitting below our living room). And after failed stud finder attempts, have gone with the strong magnet approach. Which immediately seemed to work...but then I drill up and get through the plasterboard and then...nothing...

I’ve purchased a house recently with no issues noted on the survey, we have begun the process of having a new kitchen and when the plumber has pulled the floor up to run some new pipes we have noticed the joists at the back of the house are poorly fitted at the back of the house and not sitting...

Hello After taking up a floorboard over a springy section of floor I have found 3 partially rotten joists ( last 4 inches or so) and most rotten of all the beam they sit on (i believe called a sill beam?). I am thinking to use bower beams to rectify and repair the joist ends. Any advice...

Hi I'm looking to start to floor my attic for extra spacing. I've noticed that the house has a lot of bridges between each joist. The issue is a lot of them are higher. Some are a few mm, but others are 10-20cm above the joist. I've. Included a photo below. What is the best way to get round...

Hi all I live in an 1880s victorian house with a suspended timber floor. The distance from the ground to the bottom of the joist is 20cm, the joists are 9cm deep, and the gap between joists is 32cm. The plan was to put down a permeable membrane and suspend Rockwool insulation between the...

Hi. Hope you are all well. Got a problem and can’t stop thinking about it, so would like to pick your brains! I’m laying tiles in bathroom which is just above ginnel. Before overboarding realised the whole thing is uninsulated so air from outside can easily make its way straight under the...

Hi, I am looking for the best solution to span across 2400mm doors, supporting roof joists. The building is governed by height, and I am already too high so ideally want a solution where I won’t need a wacking great box section or concrete lintel with joists supported on top. I need 150mm...

Hi, I have a bungalow that uses trusses that have a 6m span which are spaced apart by 0.6m for a total length of about 12m (about 20 trusses). Each truss uses 4 webs/posts in a 'w' formation. Forgive me if this is not the correct terminology. The trusses are made from 72mm x 36mm timber. The...

Our house is brick and block, built in 1981. On carrying out what was supposed to be simple upstairs bathroom renovations, I have uncovered some concerns in an internal breeze block wall. Essentially, it appears the wall is supported only by the timber sole plate sitting on 20mm chipboard...

Hello fellow forum users, Quick question for experienced carpenters/builders out there. My floor boards currently meet right in the middle of where joist notching is. What's the best way of fitting the t&g floorboards in my case, so these don't sag and bend the copper pipes then walked on...

We engaged a building to repair and renew some joists. In the photo below you see newly installed joists. The joists are sistered and sit on a sleeper wall. The sister joists appear glued and not bolted together. Is this acceptable In the photos below you can see an endplated installed...

I am about to put a chipboard new floor down in a bathroom and want to level the existing joists as they slope towards the party wall. It is only a very small span (1m) that needs levelling as the floor that sits underneath the bath has not been removed. I have looked at sistering the joists...