DIY Forum

 

Ultimate HandymanUltimate Handyman on Pinterest

 

DIY Forum/Home improvement advice forum

 

 

A-Z CONTENTS | DISCLAIMER | DIY VIDEO | HOME | SAFETY FIRST | FORUM RULES

It is currently Fri Apr 26, 2019 5:20 pm


Time zone: Europe/London [ DST ]




 

 


Post new topic Reply to topic  [ 4 posts ] 
Author Message
PostPosted: Thu Mar 21, 2019 11:36 pm 
Offline
Newly registered Member

Joined: Tue Dec 21, 2010 9:32 pm
Posts: 27
Has thanked: 13 times
Been thanked: 1 times
Hi,

I'm planning a garden office DIY build, which will be restricted to 2.5m due to permitted development.

In order to fit some large patio doors I've been given, I was thinking about using joist hangers directly attached to the doors' header. This gives me the size opening I need without breaching 2.5m - which putting the joists on top of the header would not.

The only problem I can see with this is with regards to ventilation. My understanding is that with a cold roof, I need a 50mm ventilation gap, and I assume I'd need to fit a vent along the length of the soffit at either end for airflow - but with my proposed design, I'd only be able to have that at one end.

Hopefully you can see what I mean in the below pic:

Image

Can anyone think of any solutions to this? I'm presuming a vent at one end only wouldn't be sufficient as the air wouldn't actually flow?

The only thing I've thought of it to run the joists from side to side rather than back to front, but I've not seen that done on a monopitched roof like this, and I don't know if there's a reason why…

Thanks

Pete


Share on FacebookShare on TwitterShare on DiggShare on Delicious
Top
 Profile  
Reply with quote  
PostPosted: Thu Mar 21, 2019 11:46 pm 
Offline
Pro Carpenter
User avatar

Joined: Sat Dec 16, 2006 10:11 pm
Posts: 21099
Location: redhill surrey an auld reekie laddie
Has thanked: 709 times
Been thanked: 2041 times
are you aware the 2.5 is from the natural ground level[adjacent to] the structure covers not the base

_________________
we are all ------------------still learning


Top
 Profile  
Reply with quote  
PostPosted: Thu Mar 21, 2019 11:54 pm 
Offline
Newly registered Member

Joined: Tue Dec 21, 2010 9:32 pm
Posts: 27
Has thanked: 13 times
Been thanked: 1 times
Yup.


Top
 Profile  
Reply with quote  
PostPosted: Fri Mar 22, 2019 12:22 am 
Offline
Pro Carpenter
User avatar

Joined: Sat Dec 16, 2006 10:11 pm
Posts: 21099
Location: redhill surrey an auld reekie laddie
Has thanked: 709 times
Been thanked: 2041 times
the reason you go front to back rather than side to side is because you buy firings giving the length and degree off angle [or height differential ]you need and they are cut in pairs to go end on end off every joist where joist spacings make minimum difference
where as side to side every single joist needs an exact height spacing and at an angle to accommodate the roof sheet exactly at the same angle

_________________
we are all ------------------still learning



For this message the author big-all has received gratitude : PeteWilliams
Top
 Profile  
Reply with quote  
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 4 posts ] 

 

 




Similar topics
   

Time zone: Europe/London [ DST ]


Who is online

Users browsing this forum: No registered users and 2 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
Visit Solent plastics


 

 

 

News News Site map Site map SitemapIndex SitemapIndex RSS Feed RSS Feed Channel list Channel list
ultimatehandyman privacy policy

Contact

 

Powered by phpBB® Forum Software © phpBB Group

phpBB SEO