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  #91  
Old 04-25-2013, 05:33 AM
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Default Re: 36" build in Tallahassee - AKA Bruce's Folly

Quote:
Originally Posted by kbartman View Post
Bruce,
The fb board is still a concern of mine I'm trusting I made the right decision. hope it don't come back to bite me. Since I decide to move on in my build, no one has posted anything further. Makes me wonder. I hope I have'nt affended anyone with my kidding around. If I did, my appologies to all. I value everyones opinion and need all the help I can get. Feel free to post on my thread.
Actually, I was a bit worried about having a difference in compression because one quadrant of the floor insulation is biosoluble and the rest are HW CF. the biosoluble has a very different texture compared to the CF and is much more fragile. I purchased the biosoluble board from skyline and there was no spec sheet on their site. I found another site that carried both types of board and compared the specs. Both boards had the same rating of less then 10% at 4,000 lbs per sq. inch. I think us 1st timers worry too much. One of the reasons I decided to take a shot at this is that it seems that as long a the dome doesn't collapse, there is enough insulation, and you get the water out (and keep it out) the resulting oven is at least functional. For example, with all our worry about the tapering bricks and small gaps, it appears that builds simply using 1/2 bricks and mortar work just fine.

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Originally Posted by kbartman View Post
I see you have really thought out the oven support. I think it will be plenty. I questioned it also till I seen the pictures underneath. I think it is rock solid with all blocks and angle underneath.
Don't know if you looked at my first thread:

http://www.fornobravo.com/forum/f6/p...rth-18862.html (Possible approach to hearth)

I was trying to come up with an approach to the stand that I could do myself while working from my wheelchair. My first approach using some metal shelves spanning the cinder block was abandoned following a number of helpful comments. An alternative and cost effective idea was offered:
Quote:
Originally Posted by Laurentius View Post
Bruce,

I can't imagine building anything on a $67 dollar shelf from Costco, heavens forbid, anything safe. $67 might get you enough blocks for your support?
So I pretty much just added cinderblock to pretty much fill in the interior of the stand and used extra angle to support the board over the storage area. I used the surface bonding because I read that it was rated to make mortar less structural walls when the interior and exterior surfaces of the block were coated. I am very confident in the resulting stand, at least here in Florida where frost and seismic activity are not a worry. Sink holes on the other hand...

Thanks again for checking in and giving the:
Quote:
Originally Posted by Laurentius View Post
Bruce,

I can't imagine building anything on a $67 dollar shelf from Costco, heavens forbid, anything safe. $67 might get you enough blocks for your support?
Bruce
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  #92  
Old 04-25-2013, 05:50 AM
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Default Re: 36" build in Tallahassee - AKA Bruce's Folly

Kbartman,
By the way, the last few days I started paying attention to the break down of active uses. Just looking at the number of users viewing threads at any one time I was surprised that so few were commenting. But then I saw that very few were members of the site. For example, right now there are 6 members and 146 guests on the site. So now I think I am more surprised at how many comments we are getting.
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  #93  
Old 04-25-2013, 07:07 AM
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Default Re: 36" build in Tallahassee - AKA Bruce's Folly

Bruce,
No I have'nt read your first thread I will though. I got to gets some sleep to day I'm working nights. Funny you should mention sink holes. How about giving me a warm fat fuzzy on this one. While cutting the pool deck floor for the fondation I discover a viod beneath the concrete slab about 8" X 2' At the time I contributed to improper fill around the pool when install 1970 I figure. I filled it in and moved on. Then yesterday I notice a few old step cracks in the wall surrounding the pool. Is my build doomed for failure from bad insulation or a sink hole........ I sure need some warm fat fuzzies. Off to bed wish me sweet dreams. ...LOL
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  #94  
Old 04-25-2013, 07:33 AM
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Default Re: 36" build in Tallahassee - AKA Bruce's Folly

Actually, I'd be more worried about that meteor...

Sweet dreams and fat warm fuzzy to ya.
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Last edited by Bec1208; 04-25-2013 at 07:35 AM. Reason: Added to comment
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  #95  
Old 04-25-2013, 01:28 PM
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Default Re: 36" build in Tallahassee - AKA Bruce's Folly

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Actually, I was a bit worried about having a difference in compression because one quadrant of the floor insulation is biosoluble and the rest are HW CF. the biosoluble has a very different texture compared to the CF and is much more fragile. I purchased the biosoluble board from skyline and there was no spec sheet on their site. I found another site that carried both types of board and compared the specs. Both boards had the same rating of less then 10% at 4,000 lbs per sq. inch.
Bruce
Looks like I posted too soon regarding the biosoluble board. I emailed Skyline and within a few hours they replied that the compressive strength of the ceramic fiber board is 0.3MPa. This compares to .5 MPa of their comparable CF board. I am going to start trimming floor brick and deal with this issue once that is done. I think I have enough scape pieces of the CF board to replace the biosoluble. Glad I caught this now and not when well into building the dome.
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  #96  
Old 04-25-2013, 01:36 PM
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Default Re: 36" build in Tallahassee - AKA Bruce's Folly

Bruce,

I accidently responded to you on Kb thread.
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  #97  
Old 04-25-2013, 02:20 PM
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Default Re: 36" build in Tallahassee - AKA Bruce's Folly

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Bruce,

When you get done trimming the Ca Sil to where you want, take your leftover mortar as you lay your bricks and render the sides of the Ca Sil board. The mortar will keep the Ca Sil from getting damaged, broken, dented while you do your dome.
Sounds like good advice. If the material stays in place I will do this.

I tried calculating the lbs per sq. inch placed on the board below the perimeter brick. I expected the result to be low, but not as low as I calculated and this was with higher then expected dome weigh. In addition at least some of the load will be transferred to the remaining board. I hope someone checks my math.

I used the following formula and values:
Weight of dome (estimated to be 2000 lbs)/Area of space between inner and outer perimeter of bricks
The first value was ((pi x 22 squared) - (pi x 18 squared))=503 sq inches
So 2000/503=4 lbs per sq inch.

Really doesn't sound like much. According to a conversion site on the web, .3 is about 44 psi and .5 is about 73 psi.

I found this definition of MPa in connection with material compression strength:

MPa is one million pascals.

A pascal, Pa, is one newton per square meter (N/m^2)

So a MPa is one million newtons per square meter.

"In material strength, it represents how much stress (force per cross sectional area) that a material can withstand without breaking/rupturing/stretching or whatever other criteria you use for failure."
What is MPa stand for when it comes to material strength? - Yahoo! Answers

Anyone comment who has experience with this issue. Thanks, Bruce
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  #98  
Old 04-25-2013, 02:55 PM
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Default Re: 36" build in Tallahassee - AKA Bruce's Folly

It should stay just fine here is a pic of mine. I learned this a little late in my build.
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  #99  
Old 04-25-2013, 03:39 PM
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Default Re: 36" build in Tallahassee - AKA Bruce's Folly

Gudday Bruce
Don't loose that Bio-sol ...... It will come in handy for insulation in your future door.
Regards dave
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  #100  
Old 04-25-2013, 05:59 PM
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Default Re: 36" build in Tallahassee - AKA Bruce's Folly

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Sounds like good advice. If the material stays in place I will do this.
Quote:
Originally Posted by UtahBeehiver View Post
It should stay just fine here is a pic of mine. I learned this a little late in my build.
Thanks for the pic, looks really well done. However, I miscommunicated on that part of my post. At the time I was questioning whether or not the biosoluble board needed to be replaced. Based on information to date, it looks like it can remain. Hope to get some more expert options on this. Bruce
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