36" build in Tallahassee - AKA Bruce's Folly

[Bec1208]

Re: 36" build in Tallahassee - AKA Bruce's Folly

Gudday
Take it back a couple of rows and start again ... Can't hurt ....you have really had no setbacks to date so the progress thus far has been all foward.
Regards dave

Dave, I am reluctant to take down the rows but will if it turns out to be the best solution. I gather from your post that cantilevering the next row is not recommended. Assuming I am okay with scrapping the last row if this doesn't work, how about using the angle grinder with a diamond blade to cut the bricks not a wedge shape? I'm at the courthouse now and the trail is scheduled for,the full day Monday and Tuesday. So I have some time to consider options, including just flattening out the next two rows. Thanks for your help.

[cobblerdave]

Re: 36" build in Tallahassee - AKA Bruce's Folly

Dave, I am reluctant to take down the rows but will if it turns out to be the best solution. I gather from your post that cantilevering the next row is not recommended. Assuming I am okay with scrapping the last row if this doesn't work, how about using the angle grinder with a diamond blade to cut the bricks not a wedge shape? I'm at the courthouse now and the trail is scheduled for,the full day Monday and Tuesday. So I have some time to consider options, including just flattening out the next two rows. Thanks for your help.

Gudday Bruce
Can't say which way is the best at this point . Is not really a case of right or wrong with emotions playing a part. So perhaps a few days with the court case will give you some give you a bit of a breather.
Regards dave

[deejayoh]

Re: 36" build in Tallahassee - AKA Bruce's Folly

I wouldn't cantilever. Just increase the tilt for that row - cut a 5 degree wedge off the bottom of the brick. That will flatten things out.

[Bec1208]

Re: 36" build in Tallahassee - AKA Bruce's Folly

They are going to try and finish an expert witness from Jacksonville so we were kept until about 6pm. Dave and deejayoh, thanks for your help.

I wouldn't cantilever. Just increase the tilt for that row - cut a 5 degree wedge off the bottom of the brick. That will flatten things out.

It seems like I would be better off cutting a wedge from the top of the last row (thereby dropping the height of the dome) and increase the tilt; or am I missing something? Bruce

[deejayoh]

Re: 36" build in Tallahassee - AKA Bruce's Folly

I think we are saying the same thing. The wedge could be from the top or the bottom, but the goal is to steepen the angle for the top face of the brick. That will make your dome meet sooner.

But usually you can get to the plug for a 36" oven in about 10-11 courses. It looks like from your last picture you are on your tenth course now, and still a couple of courses away from your plug.

Each course should steepen your angle about 8.5 degrees - and my trusty calculator says you should be at ~78 degrees with 7.5 inches between the inner brick edges. I would guess that diameter is close to a foot based on the picture. Given that, I'd at least knock those two bricks in your last course off and cut a wedge off those - and plan on doing the same for the last few courses. The alternative is going back as CD suggests to increase the angle on the previous course. But I think you can flatten it out as is. Know that it will just be trickier to mortar the bricks at that angle - and I don't think the ball shape is going to be great for getting the top as flat as you might want it.

OR you could just have a higher dome It will still work.

[deejayoh]

Re: 36" build in Tallahassee - AKA Bruce's Folly

Oh, I can definitely see you've "coned out" in this picture. The last few courses look like you haven't changed the angle at all

[Bec1208]

Re: 36" build in Tallahassee - AKA Bruce's Folly

But usually you can get to the plug for a 36" oven in about 10-11 courses. It looks like from your last picture you are on your tenth course now, and still a couple of courses away from your plug.

Last course was #10 counting from health level. Curious, if I decide to go back a few rows; what is the best way to remove bricks without damaging the ones below?

[deejayoh]

Re: 36" build in Tallahassee - AKA Bruce's Folly

Here's my dome at the 9th course - just so's you knows it happens to us all I knocked off one course and got it back on the right arc.


If you want to knock off bricks, the way to do it is with a cold chisel and light (3lb) sledge - better yet a dead hammer. But I hesitate to suggest it. I ended up knocking off 3 or 4 bricks the layer under the one I wanted to remove, and others (texman) have had even worse experiences...

I know that laying those high bricks is extra effort for you - so I want to temper the advice. I'm super impressed with what you've done already.

[stonecutter]

Re: 36" build in Tallahassee - AKA Bruce's Folly

Last course was #10 counting from health level. Curious, if I decide to go back a few rows; what is the best way to remove bricks without damaging the ones below?

As mentioned you risk breaking the bond on other bricks by hammering on the ones you want to re-set.

I suggest that you get the tip of a flat head screw driver, old chisel or better yet, a trim bar under the offending brick, and just turn it sideways to pop the brick out. The first one will be the hardest, but once you have room, rotate the bar or screw driver toward the opening..they should come off without breaking the bond below. You ca use channel locks or pliers to give your turn a little more power.

I never did this on a wfo, but I have on a historic restoration projects were you have to be extremely careful not to damage the surrounding work. I realize that the mortar is softer on old buildings, but if the mortar on your build is relatively green (3 days or less) then you should have no trouble.

[cobblerdave]

Re: 36" build in Tallahassee - AKA Bruce's Folly

Stone cutter
Bruce has already said that he has an angle grinder and blade. Would it help if Bruce chased a line horizontally along the mortar layer of brick to try and prevent vertical cracking the next layer?
Regards dave

[stonecutter]

Re: 36" build in Tallahassee - AKA Bruce's Folly

Yes it would.

[Bec1208]

Re: 36" build in Tallahassee - AKA Bruce's Folly

I know that laying those high bricks is extra effort for you - so I want to temper the advice. I'm super impressed with what you've done already.

Thanks for the thoughts, the last course wore me out, so I am glad to have the break. I was pushing it because I knew I was going to be tied up with jury duty this week. The bad part was I recognized my error half way through and kept on going anyways. I'm getting used to the reality that the best approach is to take off the last two courses. So it goes.

Here's my dome at the 9th course - just so's you knows it happens to us all I knocked off one course and got it back on the right arc.

Good to know I'm part of a club.

Stone cutter
Bruce has already said that he has an angle grinder and blade. Would it help if Bruce chased a line horizontally along the mortar layer of brick to try and prevent vertical cracking the next layer?
Regards dave

Thanks Dave, I was wondering if that would work.

[stonecutter]

Re: 36" build in Tallahassee - AKA Bruce's Folly

A word of caution about using a diamond wheel though. If you are chasing out the joint and don't keep the blade straight in your cut, it can grab and lunge out. Then there is the dust factor too...for these reasons I didn't suggest using the grinder...I did notice the post earlier Dave.

Bruce, to echo the others, your efforts are much appreciated. Please use caution if you use the grinder. I have seen nasty injuries happen to guys that use them every day.

[Bec1208]

Re: 36" build in Tallahassee - AKA Bruce's Folly

A word of caution about using a diamond wheel though. If you are chasing out the joint and don't keep the blade straight in your cut, it can grab and lunge out. Then there is the dust factor too...for these reasons I didn't suggest using the grinder...I did notice the post earlier Dave.

Bruce, to echo the others, your efforts are much appreciated. Please use caution if you use the grinder. I have seen nasty injuries happen to guys that use them every day.

Would it work (and be safer) to use a masonary cutting or grinding wheel instead of the diamond blade?

[stonecutter]

Re: 36" build in Tallahassee - AKA Bruce's Folly

It would, but the same risks are there...I just wanted you to have the facts before proceeding.