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Stone Masonry cracked over fireplace due to failure of lintel

Stone Masonry cracked over fireplace due to failure of lintel

(OP)
Hi Guys,

I'm just after some additional advice on the following situation;


A vertical crack as formed in some stone masonry above a fire place due to failure of the timber lintel support (see pictures).

I am proposing to replace the timber lintel with steel, and merely repoint the crack. Does anyone see any issues with this?




RE: Stone Masonry cracked over fireplace due to failure of lintel

I can't tell if the lintel is deformed... but the added heat has two main effects on steel... This usually results in plastic deformation. It reduces the yield strength and reduces the Young's Modulus... Crack does not look like a settlement crack... appears to be nearly uniform for the full height. Can you run a straightedge along the bottom of the lintel to see if there is any deformation.

RE: Stone Masonry cracked over fireplace due to failure of lintel

(OP)
Hi dik,

Thanks for your response. Sorry, i should have mentioned that the last photo is a steel rod which ties the two leafs of masonry together. The lintel is timber

RE: Stone Masonry cracked over fireplace due to failure of lintel

Is it a stud or brick wall? If either, then you can likely put a temporary channel secured to the studs or brick wall above the burned out lintel on each side of the wall. Bolts would be through drilled and through the studs. Remove the lintel supporting the material above with the channels temporarily supporting the load.

Forgot to add... then patch the wall.

Dik

RE: Stone Masonry cracked over fireplace due to failure of lintel

The charred wood in the first photo is that part of the lintel or is it just decorative.
Wood for a lintel in not a good idea for a fire place. I wood have used granite or some other stone for a lintel. Wood, even encased in some type of masonry work, will char when exposed to elevated temperatures, consequently, many fires have started that way and not necessarily from radiant heat generated by flams.

RE: Stone Masonry cracked over fireplace due to failure of lintel

Sparkes1992:
You really ought to have a good Mason, Architect or Structural Engineer who knows something about fireplaces and their construction, look at that and determine what went wrong, and how to fix it properly. You damn near burned the house down once, and if you don’t fix that fireplace correctly, the next time you might be successful. Your photos don’t show much which is really meaningful to the discussion. It looks like that fire started from inside the fire box. I can’t see the wooden lintel and how it’s burned or broken. We can’t tell what the third photo shows or where it is in the fire box. But, “steel rod which ties the two leafs of masonry together” doesn’t mean much without much more detail. I suspect the fire box is not properly constructed or lined with firebrick, and that there are internal cracks which are allowing heat and fire into the surrounding structure.

RE: Stone Masonry cracked over fireplace due to failure of lintel

I wonder if that steel tie rod went through a drilled hole in the firebox walls and "roof" to allow hot gasses out to the wood. That might be the ignition source.

You say "masonary" over the fireplace, but exactly what kind of masonary is it? Looks more like stucco or grout-over-CMU, not a single block of rock.

RE: Stone Masonry cracked over fireplace due to failure of lintel

That doesn't look like a lintel failure to me. I'd recommend that you have the flue inspected for cracking/gaps.

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