joe90 Posted December 10, 2023 Share Posted December 10, 2023 On 01/12/2023 at 16:52, joe90 said: solution., 1/2” ply, glued and screwed both sides of the joist. Link to comment Share on other sites More sharing options...
Dee Posted December 10, 2023 Author Share Posted December 10, 2023 Oh, it is glued too! Forgot to mention that 1 hour ago, MikeSharp01 said: Glue (probably a PU would be enough Link to comment Share on other sites More sharing options...
saveasteading Posted December 10, 2023 Share Posted December 10, 2023 2 hours ago, Dee said: 16 screws all over the place! Not quite all. the notch is out of the bottom, and that is the bit of ply that needs to be fixed hard. a few more screws down there, if you can. Link to comment Share on other sites More sharing options...
saveasteading Posted December 10, 2023 Share Posted December 10, 2023 2 hours ago, Dee said: 16 screws all over the place! Not quite all. the notch is out of the bottom, and that is the bit of ply that needs to be fixed hard. a few more screws down there, if you can. Link to comment Share on other sites More sharing options...
saveasteading Posted December 10, 2023 Share Posted December 10, 2023 2 hours ago, Dee said: 16 screws all over the place! Not quite all. the notch is out of the bottom, and that is the bit of ply that needs to be fixed hard. a few more screws down there, if you can. 1 Link to comment Share on other sites More sharing options...
saveasteading Posted December 10, 2023 Share Posted December 10, 2023 2 hours ago, Dee said: 16 screws all over the place! Not quite all. the notch is out of the bottom, and that is the bit of ply that needs to be fixed hard. a few more screws down there, if you can. Link to comment Share on other sites More sharing options...
saveasteading Posted December 10, 2023 Share Posted December 10, 2023 Sorry folks. It didn't seem to submit so I tried again and again. any way I can delete these? 1 Link to comment Share on other sites More sharing options...
Dee Posted December 10, 2023 Author Share Posted December 10, 2023 7 hours ago, saveasteading said: Not quite all. the notch is out of the bottom, and that is the bit of ply that needs to be fixed hard. a few more screws down there, if you can. Sorry, I don't understand? I had nothing to fix to below the bottom of the joist? Please expand what I should have done? Appreciate the advice Link to comment Share on other sites More sharing options...
saveasteading Posted December 10, 2023 Share Posted December 10, 2023 I mean that the notch is what needs to be spliced, so put some screws in the lower area of the ply splices. When load is applied to the joist, the bottom goes into tension. The ply can take that tension at the bottom , holding it stiff across the gap. It will do that most efficiently if there are fixings lower down ( unless there are and I'm not noticing them). 1 Link to comment Share on other sites More sharing options...
Dee Posted December 13, 2023 Author Share Posted December 13, 2023 So, giving the bathroom ...and you guys, a rest while I figure out the heating system which seems to have developed a mind if it's own! I have 18 rads, of which 6 decided not to heat up atall. So I turned off fully the 12 hot rads, and all 6 cold rads heated up . One by one I turned the 12 back on and after a few days all rads were still lovely and hot....until 2 gradually went cold and despite my best efforts have remained so. I have tweeked and twiddle the LS valves on those pipes that I believe to be effecting the 2 duds but no improvement. All rads bled, recently drained system when boiler was replaced...totally foxed! Link to comment Share on other sites More sharing options...
joe90 Posted December 13, 2023 Share Posted December 13, 2023 It all needs balancing, from cold the ones that heat up first should be restricted to allow the others to catch up, this is done on the valve on the other end of the radiator to the TRV. Link to comment Share on other sites More sharing options...
Dee Posted December 14, 2023 Author Share Posted December 14, 2023 Yeh, I have properly balanced the whole system a few years ago, down to using a multimeter to get the temp to 12⁰ across the pipes....took 2 days. I was hoping for a quick fix this time! What I don't understand is that on all the hot rads the LS is literally barely open, not even 1/4 turn, even those the farthest away from the boiler. 1 Link to comment Share on other sites More sharing options...
TonyT Posted December 28, 2023 Share Posted December 28, 2023 On 10/12/2023 at 10:52, saveasteading said: Not quite all. the notch is out of the bottom, and that is the bit of ply that needs to be fixed hard. a few more screws down there, if you can. What’s screws would you use? interested as I thought you should only use nails to prevent shear? Link to comment Share on other sites More sharing options...
saveasteading Posted December 28, 2023 Share Posted December 28, 2023 2 hours ago, TonyT said: should only use nails to prevent shear? Haven't heard that theory. No, screws do resist shear. I've taken to only buying branded screws, meaning not own-brand. Link to comment Share on other sites More sharing options...
joe90 Posted December 28, 2023 Share Posted December 28, 2023 Nails perform at their best when resisting shear force (force pulling sideways) while screws are designed to resist withdrawal force (force pulling outwards). I have heard that but what you have done is fine in my opinion along with glue. Link to comment Share on other sites More sharing options...
saveasteading Posted December 28, 2023 Share Posted December 28, 2023 Ahem. An interesting statement. Yes screws perform well in pullout, but they all have shear resistance based on how much shank is there. But nails hold things together too, and are not easy to pull out. A good interview question....when would you choose a nail or a screw? I prefer screws because I'm rubbish with a hammer, and there is a second chance. In this case the advantage of screws is in ease of fixing. 1 Link to comment Share on other sites More sharing options...
joe90 Posted December 28, 2023 Share Posted December 28, 2023 I remember a thread here a long time ago where someone used screws in joist hangers and was told it should have been nails because they work best in shear 🤷♂️. I guess it depends on the type of metal and diameter. 1 Link to comment Share on other sites More sharing options...
markc Posted December 28, 2023 Share Posted December 28, 2023 Connector screws are made for joist hangers etc. short shank under head designed for shear loads 1 Link to comment Share on other sites More sharing options...
saveasteading Posted December 28, 2023 Share Posted December 28, 2023 7 minutes ago, joe90 said: I remember a thread here indeed, you've hit the nail on the head there. I think the likelihood is that a pro would rather bash nails in than screw, so the nail spec has been assessed. 1 Link to comment Share on other sites More sharing options...
joe90 Posted December 28, 2023 Share Posted December 28, 2023 https://www.yourownarchitect.com/can-screws-be-used-with-joist-hangers/ Fir some reason i can’t cut and paste the relevant paragraph about using hanger screws or nails. Link to comment Share on other sites More sharing options...
saveasteading Posted December 28, 2023 Share Posted December 28, 2023 10 minutes ago, markc said: short shank under head designed for shear loads i had never thought of that purpose for the plain shank. i feel educated. Link to comment Share on other sites More sharing options...
joe90 Posted December 28, 2023 Share Posted December 28, 2023 (edited) Screws for joist hangers have a different shank to fill the hole in the metal (every day is a school day .) Edited December 28, 2023 by joe90 1 Link to comment Share on other sites More sharing options...
SteamyTea Posted December 29, 2023 Share Posted December 29, 2023 10 hours ago, joe90 said: Screws for joist hangers have a different shank to fill the hole in the metal That makes them bolts. Link to comment Share on other sites More sharing options...
joe90 Posted December 29, 2023 Share Posted December 29, 2023 2 hours ago, SteamyTea said: That makes them bolts. No, A bolt is a non-tapered fastener that uses a washer and nut to hold objects together. A screw is a tapered fastener that mates with an existing thread or creates its own thread in a material as it turns. Link to comment Share on other sites More sharing options...
dpmiller Posted December 29, 2023 Share Posted December 29, 2023 5 hours ago, joe90 said: No, A bolt is a non-tapered fastener that uses a washer and nut to hold objects together. A screw is a tapered fastener that mates with an existing thread or creates its own thread in a material as it turns. so what's a set- screw then? Link to comment Share on other sites More sharing options...
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