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deflection
The vertical deflection (VD) or deflection of the vertical (DoV), also known as deflection of the plumb line and astro-geodetic deflection, is a measure of how far the gravity direction at a given point of interest is rotated by local mass anomalies such as nearby mountains. They are widely used in geodesy, for surveying networks and for geophysical purposes.
The vertical deflection are the angular components between the true zenith-nadir curve (plumb line) tangent line and the normal vector to the surface of the reference ellipsoid (chosen to approximate the Earth's sea-level surface). VDs are caused by mountains and by underground geological irregularities and can amount to angles of 10″ in flat areas or 20–50″ in mountainous terrain).The deflection of the vertical has a north-south component ξ (xi) and an east-west component η (eta). The value of ξ is the difference between the astronomic latitude and the geodetic latitude (taking north latitudes to be positive and south latitudes to be negative); the latter is usually calculated by geodetic network coordinates. The value of η is the product of cosine of latitude and the difference between the astronomic longitude and the longitude (taking east longitudes to be positive and west longitudes to be negative). When a new mapping datum replaces the old, with new geodetic latitudes and longitudes on a new ellipsoid, the calculated vertical deflections will also change.
Hi, and thanks for any advice. After pulling over 900 lbs of dead weight in the center of my joists I had no deflection for tiling a bathroom floor ( roughly 6.5' x 6.5'). I measured from the floor below to see if there was any measurable deflection/sag, but there was not even a 1/16 of an inch...
I would like to install slate tile on the hallway and foyer (blue rectangles) of my house. However, I don't think the framing in the hallway meets the L/720 deflection necessary for natural stone. So I was hoping I could get some advice and opinion on fixes and feasibility of such a project...
I have screwed down my floorboards in all places and feels really solid but ... right up against the front door where there doesn’t appear to be a joist so it dips maybe 3-4mm with my full weight on it. The next joist is 8 inches further into the hallway and no movement . Should I rip up the...
Evening all,just looking for others opinions on this subject. So today I turned up at a job to tile a kitchen floor only to find it has been covered in 6mm ply after I recommend cement board or backer board be put down,it's screwed down every 6 inches with drywall screws and they have clearly...
Hello
I am a DIYer and after a successful shower tile project set about tiling bathroom floor. Victorian terraced house, previous floor - exposed original floorboards. After research and consultation with a carpenter, I understood that the deflection wasn't bad and that I should screw down any...
My bathroom floor is 12" x 2" joists on 400mm centres covering a 3.0m span. This is overlayed with 18mm chipboard screwed to the joists overlayed with 12mm ply screwed on a 5" grid. The ply had its edges and back face coated in SBR.
The tiles are 600 x 300 porcelain laid on a single part...
I've been to see a job where tiles are coming loose on a ply overlaid floor. Underneath the ply it's chipboard but you can feel the floor bounce when you jump on it easily. I've told the guy that he really needs to take up the floor, strengthen with noggins and relay but he doesn't want to due...
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...
jesteh
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deflection
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Hi Lads,
I have a wetroom I need to tank, it is 4m x 1m (with marmox showerstone tray taking up 1m2 at one end).
I floored the rest of the upstairs & wetroom with 18mm WBP.
I have just realised / noticed that there is a join in the ply running perpendicular to the joists right at the door...
Does anyone know of any authorative publication that specifies the allowable deflection tolerances in wooden suspended floors when laying marble tiles
(in my case 600x600x20thick)
Cheers
Ian
Ian Harris
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deflection
floor
floor tiling
floors
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usa
hi! guys and gals ! got a problem understanding deflection and how to cure it. priced a job up with a 5mtr floor with deflection (floor boards). now Ive searched a lot of posts on this subject and iam getting different answers ? some say over boarding cures deflection ? others say it doesn't...
was wondering at wot point of a quotation you would determine there was to much bounce in a floor ? i mean how do i no if i need to quote for taken up floors etc ? is a tiny bit bounce acceptable ? as the addy is flexi ?or is there something you can put down on a floor with slight bounce instead...
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