Wed, 22 Apr 2026 10:35:39 +0100 https://www.greenbuildingforum.co.uk/newforum/ Lussumo Vanilla 1.0.3 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=14821&Focus=252684#Comment_252684 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=14821&Focus=252684#Comment_252684 Mon, 09 Jan 2017 20:07:21 +0000 joe90
With regard the glulam ridge beam ( which I cannot see the need for) I have had this discussion before, with a pitched roof the ridge beam simply ties the two sets of rafters together and carries no weight as such. If ( like a loft conversion) one pitch was removed then yes a beam, steel or glulam is needed to carry the weight of the slope retained but with equal and opposite slopes surely this is not required.

Surely 300mm I joists over a 5 mtr span at an angle of 35 degrees is not rocket science to calculate ( I
wish I had become a SE or at least learnt the theory before I started this project). We are also getting into the realms of paying for an S.E. to make these calculations which obviously I would like to avoid.

So, am I barking up the wrong tree?, am I trying to be too simplistic?, I cannot for the life of me see the requirement for steels.

HELP]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=14821&Focus=252685#Comment_252685 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=14821&Focus=252685#Comment_252685 Mon, 09 Jan 2017 21:36:38 +0000 owlman https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=14821&Focus=252687#Comment_252687 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=14821&Focus=252687#Comment_252687 Mon, 09 Jan 2017 21:56:26 +0000 Peter_in_Hungary
You might find that in the end you will need an SE (with professional liability insurance) to calculate and assure the design. Such things happen when you step out of the 'deemed to satisfy' or the standard loading tables areas of building design]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=14821&Focus=252689#Comment_252689 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=14821&Focus=252689#Comment_252689 Mon, 09 Jan 2017 22:22:38 +0000 tychwarel https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=14821&Focus=252691#Comment_252691 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=14821&Focus=252691#Comment_252691 Mon, 09 Jan 2017 22:35:46 +0000 tychwarel http://s1214.photobucket.com/user/nantcoly/media/Ty%20chwarel%20build%20blog/roof%20structure/008.jpg.html][IMG]http://i1214.photobucket.com/albums/cc492/nantcoly/Ty%20chwarel%20build%20blog/roof%20structure/008.jpg[/IMG][/URL]

[URL=http://s1214.photobucket.com/user/nantcoly/media/Ty%20chwarel%20build%20blog/roof%20structure/008.jpg.html][IMG]http://i1214.photobucket.com/albums/cc492/nantcoly/Ty%20chwarel%20build%20blog/roof%20structure/008.jpg[/IMG][/URL]]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=14821&Focus=252692#Comment_252692 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=14821&Focus=252692#Comment_252692 Mon, 09 Jan 2017 22:40:46 +0000 tychwarel http://s1214.photobucket.com/user/nantcoly/media/Ty%20chwarel%20build%20blog/roof%20structure/008.jpg.html]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=14821&Focus=252697#Comment_252697 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=14821&Focus=252697#Comment_252697 Tue, 10 Jan 2017 07:47:30 +0000 SteamyTea Posted By: joe90I wish I had become a SE or at least learnt the theory before I started this projectNever too late

http://web.mit.edu/4.441/1_lectures/1_lecture5/1_lecture5.html]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=14821&Focus=252707#Comment_252707 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=14821&Focus=252707#Comment_252707 Tue, 10 Jan 2017 11:13:48 +0000 djh
Tychwarel, as well as photos, can you remember who supplied your roof?

It might also be worth contacting one or two manufacturers (Metsa etc) to see if they can help.]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=14821&Focus=252709#Comment_252709 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=14821&Focus=252709#Comment_252709 Tue, 10 Jan 2017 11:23:43 +0000 joe90
Nick, yes never too late and I would be interested to learn just wish I had done it already to get me out of this mess.]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=14821&Focus=252717#Comment_252717 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=14821&Focus=252717#Comment_252717 Tue, 10 Jan 2017 13:04:43 +0000 Ed Davies
Mine will have a ridge beam but it's not that heavy - slices of ply staggered and bolted together.

Starting from scratch I think the big thing I'd want to learn a lot more about is structural engineering. My house would eventually need an SE sign off anyway but having a detailed plan which was generally plausible but just needed a few tweaks would have saved me a bit of hassle and left me with a design I was happier with the construction of, I think.]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=14821&Focus=252738#Comment_252738 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=14821&Focus=252738#Comment_252738 Tue, 10 Jan 2017 18:47:19 +0000 ringi https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=14821&Focus=252740#Comment_252740 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=14821&Focus=252740#Comment_252740 Tue, 10 Jan 2017 18:56:54 +0000 Fred56
Try OU T357, introduces the basics and a good understanding.

Bits of it are free through the OpenLearn portal.]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=14821&Focus=252742#Comment_252742 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=14821&Focus=252742#Comment_252742 Tue, 10 Jan 2017 19:13:51 +0000 Peter_in_Hungary Posted By: ringiI wish there were architects that understood structural engineering and “buildability”, it seems that architects don’t care how hard it is to build, or what size beams will be needed for their nice shapes
Architects have the dreams, the SEs job is make sure the dreams don't fall down..........Daughter-in-law an architect, Son-in-law a SE.]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=14821&Focus=252744#Comment_252744 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=14821&Focus=252744#Comment_252744 Tue, 10 Jan 2017 19:59:48 +0000 joe90
Thanks guys]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=14821&Focus=252758#Comment_252758 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=14821&Focus=252758#Comment_252758 Wed, 11 Jan 2017 14:42:37 +0000 fostertom https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=14821&Focus=252760#Comment_252760 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=14821&Focus=252760#Comment_252760 Wed, 11 Jan 2017 16:02:54 +0000 joe90
Main reason for I beams as rafters is they give me 300mm depth for insulation without massive timbers ( warm roof)I will report back, wish me luck.]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=14821&Focus=252765#Comment_252765 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=14821&Focus=252765#Comment_252765 Wed, 11 Jan 2017 21:33:29 +0000 fostertom https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=14821&Focus=252767#Comment_252767 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=14821&Focus=252767#Comment_252767 Wed, 11 Jan 2017 22:30:25 +0000 Ed Davies ]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=14821&Focus=252769#Comment_252769 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=14821&Focus=252769#Comment_252769 Thu, 12 Jan 2017 07:09:49 +0000 SteamyTea https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=14821&Focus=252771#Comment_252771 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=14821&Focus=252771#Comment_252771 Thu, 12 Jan 2017 08:51:29 +0000 fostertom http://pasquibbs.co.uk]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=14821&Focus=252772#Comment_252772 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=14821&Focus=252772#Comment_252772 Thu, 12 Jan 2017 09:26:42 +0000 SteamyTea That is then a very slippery slope.
If anyone is interested, and I doubt if they are. It is pronounced scone (with a capital O) before it is eaten, and scone (as in gone) once eaten.]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=14821&Focus=252774#Comment_252774 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=14821&Focus=252774#Comment_252774 Thu, 12 Jan 2017 10:08:28 +0000 joe90
http://www.donnybrooktimberframes.co.uk/files/I-Joists%20-%20Boise%20UK%20Technical%20Guide.pdf

I am hoping this will sort my problem out, if not I will be in touch with the S.E. that ft recommends.]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=14821&Focus=252777#Comment_252777 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=14821&Focus=252777#Comment_252777 Thu, 12 Jan 2017 10:57:46 +0000 dickster
We have an I beam roof (walls and floor) with 300mm insulation. Look for Little Dockens build part 2 (?) video on Youtube, Might be of help]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=14821&Focus=252778#Comment_252778 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=14821&Focus=252778#Comment_252778 Thu, 12 Jan 2017 11:42:34 +0000 joe90 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=14821&Focus=252782#Comment_252782 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=14821&Focus=252782#Comment_252782 Thu, 12 Jan 2017 12:23:54 +0000 Greenfish https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=14821&Focus=252785#Comment_252785 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=14821&Focus=252785#Comment_252785 Thu, 12 Jan 2017 13:33:06 +0000 joe90 1/. flex is the bend within the rafter and it depends on the weight and depth of the timber/ijoist
2/. Spread is the tension in the ceiling joists created by the weight of the whole roof ( I admit this could be less if a ridge beam were installed)
3/. W1 is the equal weight on both wall plates of the whole roof ( unless a ridge beam is installed)
4/. W2 is the equal and opposite weight both sides of the roof create by resting on one another ( think of house of cards)

The various pressures are dependant on angle a.

therefore if all the above is adequate there is no need for W to be supported I.e. No ridge beam.]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=14821&Focus=252786#Comment_252786 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=14821&Focus=252786#Comment_252786 Thu, 12 Jan 2017 13:34:18 +0000 joe90 Posted By: joe90Sorry guys but this is bugging me so I needed to do a drawing, now from my very simplistic drawing I fail to understand why "W" needs support from below
1/. flex is the bend within the rafter and it depends on the weight and depth of the timber/ijoist
2/. Spread is the tension in the ceiling joists created by the weight of the whole roof ( I admit this could be less if a ridge beam were installed)
3/. W1 is the equal weight on both wall plates of the whole roof ( unless a ridge beam is installed)
4/. W2 is the equal and opposite weight both sides of the roof create by resting on one another ( think of house of cards)

The various pressures are dependant on angle a.

therefore if all the above is adequate there is no need for W to be supported I.e. No ridge beam.


Oops unable to load diagram it says it's too big! ( I think this is an iPad problem)]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=14821&Focus=252787#Comment_252787 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=14821&Focus=252787#Comment_252787 Thu, 12 Jan 2017 13:48:48 +0000 SteamyTea Posted By: joe90I think this is an iPad problemProbably just the image too big.
But there is an "i" in Sh!t ]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=14821&Focus=252799#Comment_252799 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=14821&Focus=252799#Comment_252799 Thu, 12 Jan 2017 15:51:38 +0000 joe90 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=14821&Focus=252800#Comment_252800 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=14821&Focus=252800#Comment_252800 Thu, 12 Jan 2017 15:56:42 +0000 SteamyTea Generally a 800pixel by 600pixel will be small enough.
There should be an option to resize and save the image on the iCant Do It somewhere.

http://www.iosappweekly.com/resize-photos-iphone-ipad/]]>