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jema
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Joined: 28 Oct 2004
Posts: 28098
Location: escaped from Swindon
PostPosted: Wed Mar 31, 21 7:42 am    Post subject: Reply with quote
    

dpack wrote:


is it a"well ventilated" alpine house or will it become a "sealed" greenhouse?


We have two other true greenhouses so the plan for the summer at least is ventilated.

Strength is always a question, but my box of 500 7.5mm screws I bought a few weeks ago is on its last and more are on order. There's a lot of timber here and the polycarbonate screwed to 2 by 2 frames is a source IMHO of strength not weakness. It's kind of hard to see what could break that doesn't involve scores of inch deep screws coming apart.


Sorry if not clear on deck, but basically extending deck a fair bit less than planned so as to maximise potential for what might be done in the marshy pit.

If I change my mind again and want to further extend the top I will only have committed the crime of having a better repaired bank with an extra solid post.

dpack



Joined: 02 Jul 2005
Posts: 45374
Location: yes
PostPosted: Wed Mar 31, 21 8:38 am    Post subject: Reply with quote
    

break is probably not an issue but reduce twists is a good idea

corner shelves could be brackets and useful for seedlings etc

Slim



Joined: 05 Mar 2006
Posts: 6533
Location: New England (In the US of A)
PostPosted: Wed Mar 31, 21 11:01 am    Post subject: Reply with quote
    

I have seen poly tunnels bend steel tubing, and known an entire greenhouse (30x96 feet) that was lifted up a few inches and set back down (by a wind storm).
Semi ventilated makes these issues worse.
If the poly panel stays affixed to each wooden frame than it just acts as an individual sub unit that will have high forces exerted upon it.
Brackets are cheaper than buying all those materials again.

Maybe you don't get storms like I do, but I wouldn't leave such a structured so loosely tied together.

jema
Downsizer Moderator


Joined: 28 Oct 2004
Posts: 28098
Location: escaped from Swindon
PostPosted: Sat Apr 03, 21 6:36 am    Post subject: Reply with quote
    






Roof completely on. One of the next tasks is a gate where the step ladder is. That will cut down on the wind and inadvertently join things up to give us sort of a continual back fence well back from where the old one perched precariously on the steep plummet down to the marsh. We have kicked off hedging and other stuff to create something organic and stabilising in place of fencing in such an implausible position.

dpack



Joined: 02 Jul 2005
Posts: 45374
Location: yes
PostPosted: Sat Apr 03, 21 10:34 am    Post subject: Reply with quote
    

Slim wrote:
I have seen poly tunnels bend steel tubing, and known an entire greenhouse (30x96 feet) that was lifted up a few inches and set back down (by a wind storm).
Semi ventilated makes these issues worse.
If the poly panel stays affixed to each wooden frame than it just acts as an individual sub unit that will have high forces exerted upon it.
Brackets are cheaper than buying all those materials again.

Maybe you don't get storms like I do, but I wouldn't leave such a structured so loosely tied together.


this, and some extras

it looks ace but a good gust could rip that to bits, i grew up in a windy place, i have lived in windy places, even quiet places get a decent blow now and again

think how that might behave as a model in a wind tunnel
you have done a load of great work but that one needs strength and a few tweaks if it is to last

dpack



Joined: 02 Jul 2005
Posts: 45374
Location: yes
PostPosted: Sat Apr 03, 21 10:45 am    Post subject: Reply with quote
    

have you got any steel rope knocking around?

jema
Downsizer Moderator


Joined: 28 Oct 2004
Posts: 28098
Location: escaped from Swindon
PostPosted: Sat Apr 03, 21 12:50 pm    Post subject: Reply with quote
    

dpack wrote:
have you got any steel rope knocking around?


I was contemplating steel rope at one point, but didn't see it quite working in the end.

I do plan on adding some reinforcements and it will end up more sealed. But I really think it's tougher that it might look.

jema
Downsizer Moderator


Joined: 28 Oct 2004
Posts: 28098
Location: escaped from Swindon
PostPosted: Mon Apr 05, 21 6:23 am    Post subject: Reply with quote
    






Built up the corner a bit and bunged in some old plastic shed panels for the wintry week we seem due.
Even before closing an entrance with a panel it was 3c warmer inside than out.

gz



Joined: 23 Jan 2009
Posts: 8571
Location: Ayrshire, Scotland
PostPosted: Mon Apr 05, 21 8:26 am    Post subject: Reply with quote
    

Nice. Room to grow and room to move around

dpack



Joined: 02 Jul 2005
Posts: 45374
Location: yes
PostPosted: Mon Apr 05, 21 8:39 am    Post subject: Reply with quote
    

it looks ace for temperature and light etc

my small worry is a once in a while wind and /or many gentle "breezes" making it wonky and taking it and toto out of kansas

screwfix used to have a selection of serious brackets , straps and screws at decent prices

for straps and long flat multihole brackets travis perkins may be worth a look

ps coach screws are pretty useful as well

i had seen 2 garages blow away before i had long trousers (Yorkshireman comment ) and i have lived on top of very windy things for a cuppa or a couple of years
wind needs consideration

re the steel rope thing.

you have decent size lumps of concrete in the floor to take any anchors, a bit of rope lay plan, some chemical anchors and wire rope+ shackles is cheap compared to the time and materials used so far
ps the ropes do not need to be intrusive, with a bit of planning they can be very subtle, will last decades and add compression to the structure

it might seem overkill but kill the wind first time or dodge the tumbleweeds

jema
Downsizer Moderator


Joined: 28 Oct 2004
Posts: 28098
Location: escaped from Swindon
PostPosted: Mon Apr 05, 21 11:35 am    Post subject: Reply with quote
    

One thing that might be missing from your thoughts about the structure is that a lot of it is anchored to tall raised beds that are rather heavy.
I'm cutting down the amount of ventilation by quite a lot which should also help.

dpack



Joined: 02 Jul 2005
Posts: 45374
Location: yes
PostPosted: Mon Apr 05, 21 1:57 pm    Post subject: Reply with quote
    

if the anchors are in place , as they are, it might be easy cheap and wise

overengineering is my thing, it does last though which makes it overengineering with purpose

make it once, with no disappointing distresses over time:wink:

jema
Downsizer Moderator


Joined: 28 Oct 2004
Posts: 28098
Location: escaped from Swindon
PostPosted: Tue Apr 06, 21 1:33 pm    Post subject: Reply with quote
    



Bubble wrap and chicken wire. A crude but effective way to have insulation now and butterfly protection later.
It's now got exactly airtight, but no longer breezy.

tahir



Joined: 28 Oct 2004
Posts: 45389
Location: Essex
PostPosted: Tue Apr 06, 21 1:36 pm    Post subject: Reply with quote
    

Looks good

dpack



Joined: 02 Jul 2005
Posts: 45374
Location: yes
PostPosted: Tue Apr 06, 21 2:00 pm    Post subject: Reply with quote
    

It's now got exactly airtight, but no longer breezy.
_________________

that will help a lot

what does it need for a few decades of wind?

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