blatterjr
sage
Reged: 08/13/07
Posts: 263
Loc: Saint Petersburg Florida
|
|
Sorry for the mis-type, I corrected it to read properly. You *will* get condensation on exposed metal panels when its cool inside and there is solar exposure outside.
This is consistent south of Tennessee and less dramatic in arid climates out west.
--------------------
Robert
---------------------
Meade 12-LX200-ACF
BINO: Nikon AEX 10x50 6.5°
DSLR: Nikon D70+CCPro2
---
Saint Petersburg Florida
27°47'22.92"N , 82°43'09.48"W
|
John Fitzgerald
In Focus
Reged: 01/04/04
Posts: 1253
Loc: AR
|
|
Robert-
It also depends on ventilation levels-more ventilation=less chance of condensation. We typically don't get condensation under roofs of most metal barns around here. I had a metal roof garage for many years, never "rained" inside, but was well ventilated. ****You get condensation when warm inside air hits cold metal, not an issue if well ventilated.***
--------------------
?
Observing since 1966
Messier Cert #898
Edited by John Fitzgerald (06/17/08 02:55 PM)
|
WidowMaker
scholastic sledgehammer
Reged: 12/29/07
Posts: 815
Loc: Frankfort, Ky
|
|
Hey yall. Thanks for the help.
I just got back from the Lowe's in the town over that has a working saw and got 7 4'x8' pieces of 15/32 #4 roofing panels/osb stuff. I also got the #15 felt paper but forgot to get the Reflectix stuff.
Since it goes on the inside, I can put it on once Ive went ahead and put my wood roof and felt paper stuff on, right?
The way yall make it sound is that I can put the Reflectix stuff up on the inside of the roof, shiny side up.
Is that correct?
--------------------
Sleep is the Cousin of Death
|
1965healey
Carpal Tunnel
Reged: 06/23/07
Posts: 2844
Loc: San Antonio, TX
|
|
Yep!  
--------------------
1965Healey (Karen)
Woodlawn Lake Observatory
Celestron CPC 800/FT MIcro/APT Wedge
SV NHNG 80mm #0261/CG5-GT
Celestron Omni 150 XLT
Losmandy rails/rings
Starizona CWeight system
Celestron Neximage
Sony a100 DSLR/ZigView S2
Meade DS60's w/Autostar (2)
Meade LPI/Meade DSI-C/DSI ProII
750cc Honda Shadow Spirit (Thanks Dad!)
1965 Austin Healey 3000 MKIII
|
blatterjr
sage
Reged: 08/13/07
Posts: 263
Loc: Saint Petersburg Florida
|
|
Quote:
Robert-
It also depends on ventilation levels-more ventilation=less chance of condensation. We typically don't get condensation under roofs of most metal barns around here. I had a metal roof garage for many years, never "rained" inside, but was well ventilated. ****You get condensation when warm inside air hits cold metal, not an issue if well ventilated.***
Yes, its situational and ventilation helps considerably.
Here (in the southeast) we have a lot of problems with interior condensation and mold/disintegration. My line of work brings contact with too many of these situations and all I can tell people is how to do it right next time, sadly. 
--------------------
Robert
---------------------
Meade 12-LX200-ACF
BINO: Nikon AEX 10x50 6.5°
DSLR: Nikon D70+CCPro2
---
Saint Petersburg Florida
27°47'22.92"N , 82°43'09.48"W
|
WidowMaker
scholastic sledgehammer
Reged: 12/29/07
Posts: 815
Loc: Frankfort, Ky
|
|
Hey yall.
We just got done trying to add crossbraces and as many metal braces as I could find somewhere to put them!
Seems pretty strong now! I could hang from it anywhere and jerk my big ole sloppy body around and it seemed very stable. 
I went back and got more braces, and a $50.00 roll of the Reflectix stuff. I got all my wood for the roof, a roll of felt paper, and tommorrow i may go get the metal roofing stuff.
Heres some shots. Try to overlook my horrible cuts, and inability to figure out the correct angles to cut stuff.
Hopefully with all the bracing weve done, itll be just fine.
--------------------
Sleep is the Cousin of Death
|
WidowMaker
scholastic sledgehammer
Reged: 12/29/07
Posts: 815
Loc: Frankfort, Ky
|
|
Weve added three more cross braces. One in them iddle, and two on each side, equally spread out.
--------------------
Sleep is the Cousin of Death
|
WidowMaker
scholastic sledgehammer
Reged: 12/29/07
Posts: 815
Loc: Frankfort, Ky
|
|
Weve still got a few more support boards to add, but this was all we were able to accomplish today.
--------------------
Sleep is the Cousin of Death
|
WidowMaker
scholastic sledgehammer
Reged: 12/29/07
Posts: 815
Loc: Frankfort, Ky
|
|
And one last...
--------------------
Sleep is the Cousin of Death
|
Bowmoreman
Carpal Tunnel
Reged: 09/11/06
Posts: 2992
Loc: Bolton, MA
|
|
That will be fine, now, young man... Quite enough... you can stop on the bracing! 
Keep up the good work, Michael!
That's going nowhere, even under my New England winter snow loads...
ps: 2x4 crossers would have been MORE than enough... 
Keep it up!
clear enough skies
--------------------
Dave
Ustream
YLive
XT10i, RTP, CGE, R200CF, TMB80SS
31T5, 22T4, 13Ethos, 8Ethos, TV 3-6 Zoom; Paracorr
MallincamColorHyperPlus,SBIG STV&237A;CanonRebel Xti
WilderSkiesObservatory(BYO #90)
|
Rusty
Postmaster
Reged: 08/06/03
Posts: 16399
Loc: Brooker, FL
|
|
You're definitely making more incredible progress...but down to nit-picking: How are the ends of the lower spans on the rafters fastened at the ends? I'd suggest carriage bolts, which can take shear loads nails or wood screws can't. The shear load at those points can be considerable.
I also see a space at the top of the center riser, meaning that load is carried soley by the metal strap. I'd suggest replacing that piece with one precisely cut to bear the load. Note that the major stress will be at the ends of the rafters (at the location I mentioned above), but good fitment of the riser adds strength and stability.
Lastly, general comments about the use of straps:
1. They should be attached so the load on the fasteners is shear-only. In the third photo, there are some 90° straps from the risers to the purlins that are holding the latter in place only by the tensile resistance of the screws to pull out of the wood. Doubtful this will cause problems, as the loads should be mostly compressive on the load bearing riser itself. Anyway, there are straps that have a 90° "twist" which allow shear-only placement.
2. Screws/nails can only hold reliably cross-grain; neither will have much strength into endgrain. I didn't see any of these, but it's something to keep in mind.
--------------------
N11GPS Fastar
TOA-130S
MK66 Std
Vintage C5
Megrez II 80mm ED Triplet APO
SolarMax 40
NJP Temma II
Sirius EQ-G
ST8XE/CFW-8(LRGBHa)/AO-7/DF-2/STV Dlx/ST237a/350D (Unmodded)/Mallincam Color Hyper Plus/DSI III Color/DSI II Pro
Two not-spoiled Golden Retrievers - Maggie and Casey
Sometimes I think we're alone in the universe, and sometimes I think we're not. In either case the idea is quite staggering. - Arthur C. Clarke
|
THEPLOUGH
Nailed Again
Reged: 01/11/08
Posts: 3957
Loc: Carlisle, Cumbria, ENGLAND
|
|
That roof is going no where, I would go as far as saying it would survive a small bomb landing on it....  . By the time you get the boards on it will be strong enough too survive anything... Once again you and your good lady have excelled and shown what can be done with effort and determination......  ..... These are for your good wife, she deserves the real thing..... 
--------------------
Geoff...
Nexstar 8SE -- 9X50 RACI Finder scope... 6.3 F/R.-- 13 & 17mm Hyperion EPs.. 25mm Celestron E- Lux EP.. 2X Celestron X-Cel Barlow----- Celestron solar filter + A few bits and pieces..
Never give up on any one..... MIRACLES happen every day....
|
WidowMaker
scholastic sledgehammer
Reged: 12/29/07
Posts: 815
Loc: Frankfort, Ky
|
|
Mornin, Yall.
Thanks alot for the nice words! Geoff, you sound like the nicest guy ever, please dont come to the states! My wife's gonna read that and say 'wow, who is this wonderful guy?!' 
Just remember, its a package deal, she comes with baggage! 
We decided were going to go on a 'date' after 6 years of passing in the hallway once this project is done. My luck, well go out and Ill fall asleep at a restaurant!
Quote:
How are the ends of the lower spans on the rafters fastened at the ends? I'd suggest carriage bolts, which can take shear loads nails or wood screws can't. The shear load at those points can be considerable.
I appreciate nit picking, Rusty. A little thing here or there could be a major thing down the road.
Im going to get some more bolts, I used them all on the floor and posts. Id like something more than nails personally. They are 3 1/2" ring shanked nails, kinda like screws, galvanized, and made for the Paslode nail gun which is truly a gift from God.
Id of accidentally killed myself with a regular hammer and nails by now.
Quote:
I also see a space at the top of the center riser, meaning that load is carried soley by the metal strap. I'd suggest replacing that piece with one precisely cut to bear the load. Note that the major stress will be at the ends of the rafters (at the location I mentioned above), but good fitment of the riser adds strength and stability.
Yeah, youre right. Our problem was no one within three counties had anything long enough to run the whole length.
we tried every lumber company and lumber carrying store we could find in the phonebook or on google and no one carried a 2x6x18.
What we did was put those big metal braces on the sides, staggered the seam, and then put the 1/2"x6" thick metal bar 'strap' thingie under and above. That was the best we could do with what we had.
You may only be able to see the big strap plate, but its got two thicker pieces on the top and bottom.
I hung from it lastnight. Im about 180-185lbs soaking wet and it felt nice and strong. That really was all we could do to put a rafter that long up.
Thats why we went ahead and put another pyramid thingie right in the middle, so we could just cut 2x6x10 boards, and have them actually fit.
Today were having trouble trying to find the type of metal roofing Scott seems to use. Lowe's and our horrible lumber company seem to have the same thing: wavy kinda flimsy metal. I dont think thats what he used.
Hopefully tonight, we can make all our cuts and at least put a wood roof above. That sun is brutal out there!
--------------------
Sleep is the Cousin of Death
|
John Fitzgerald
In Focus
Reged: 01/04/04
Posts: 1253
Loc: AR
|
|
That's strange about the lumber. 2x6 is COMMONLY available around here in lengths up to 24 feet. It's a smaller area population wise than you live in. Did you check "contractor" outlets? Lowes specializes in stuff for remodeling and small projects.
--------------------
?
Observing since 1966
Messier Cert #898
|
WidowMaker
scholastic sledgehammer
Reged: 12/29/07
Posts: 815
Loc: Frankfort, Ky
|
|
Yeah, John. Everywhere we tried, when they said no, wed ask if they knew of any other company that might carry it, and always got 'naw we got 2x6x16 though...'
Im not even going to mention what would happen when Id mention what I was trying to build.
In one of the more polite questions i can post it was as simple as 'youre building a what...?', or once I even got a 'whatcha doing that for...'? cos everyone with a brain knows you can just gaze at stars from your wobbly deck!
Im like in Bizarro world here.
Our local lumber company just yesterday could not tell me if it would be cheaper to have them bring me 7 pieces of 4'x8' roofing wood, or to have them cut it and me pick it up.
I swear! i kept saying its thirty dollars to deliver it so wouldnt it be cheaper to have you cut it in 4x4 sections I can put in the van, and the guy kept saying that it just depending on what they were doing at the exact moment I wanted the cuts!
Seemed rather silly to me, so I drove to the next town to Lowe's rather than encourage development in their company.
I try to support 'mom and pops' whenever I can but yikes... 
--------------------
Sleep is the Cousin of Death
|
John Fitzgerald
In Focus
Reged: 01/04/04
Posts: 1253
Loc: AR
|
|
Around here, I can get 18 or 20 footers at any of five or six places. The ONLY ones that do not carry lumber over 16 feet is Lowes and Home Depot.
Edit:
You should talk to a local home builder, and find out where he gets his lumber over 16 feet. I got some big 24's for my house. Someplace around there HAS to have long lumber, or they are not building anything much at all.
--------------------
?
Observing since 1966
Messier Cert #898
Edited by John Fitzgerald (06/18/08 12:42 PM)
|
John Fitzgerald
In Focus
Reged: 01/04/04
Posts: 1253
Loc: AR
|
|
By the way, NEVER say at any supply place that you are building an observatory. I just said "outbuilding" or "shed". If you say "observatory" they will dismiss you as a kook.
--------------------
?
Observing since 1966
Messier Cert #898
|
bdjeep
super member
Reged: 01/29/07
Posts: 186
Loc: Bolton, MA
|
|
Just tell 'em you are building a pool-house with a roll off roof so you can sunbathe in it. They'll probably think you're less of a kook than if you say "observatory."
Looks great, by the way. This thread will be a great resource to anyone thinking of tackling this project.
--------------------
|
cnstarz
professor emeritus
Reged: 12/22/07
Posts: 538
Loc: Kentucky, USA
|
|
Quote:
Im like in Bizarro world here.
Ahhh... I've lived in this area my whole life and truer words were never spoken.
 This is an amazing thread. Your progress is astonishing, I hope everything goes well with You and Family and you can get back to Astronomy soon.
Cheers,
--------------------
Matt
Apogee 50mm BB scope
ETX-60 BB
Meade 70-az
5" DIY Newt (wip)
C6-N on CG-4 GEM
Gallery
|
John Fitzgerald
In Focus
Reged: 01/04/04
Posts: 1253
Loc: AR
|
|
It's true about getting back to astronomy. While that observatory project was going, I was either too tired to do any observing, or all my hauling space was taken up by tools and materials.
--------------------
?
Observing since 1966
Messier Cert #898
|
Previous
Index
Next
Threaded
[Re: 
Edit
Reply
Quote
