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Porch ledger atachment to house – natural stone veneer

norton_31 | Posted in Construction Techniques on March 28, 2016 01:20am

I want to put a porch roof onto our house.  The roof will wrap around the front and one side of the house and attach just under the second story windows.  The gable roof eave is above this side of the house, and the house has a natural stone veneer (5″ approx) over 1 1/2″ polystyrene, house wrap, OSB then 2×6 studding filled with batt insulation.  My question is how do I securely attach the roof ledger to the house?  The house has a steel roof and I plan to have a similir steel roof on the porch section.

Any advice would be greatly appreciated.

regards,

Mark

Ontario, Canada

(read significant snow load)

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  1. finefinish | Mar 28, 2016 08:32pm | #1

    Hi there,

          I have attached roofs like the one you describe to stucco buildings using glue in anchors at the ledger.  I would drill a 1/2" hole and glue in threaded rod.  Hilti, Sika, and Simpson make good anchoring epoxies for rebar, rod, etc.  Assuming this roof has a decent pitch, the ledger will not get loaded like a deck ledger.  There will be much less shear and withdrawal force acting on these fasteners.  The connection at the bottom of the rafters is critical too.  The posts and beams will bear alot of the roof load and assuming they are sized and braced properly, the ledger theoretically needs no help staying put - the rafters hold it up and tight against the wall. 

  2. DanH | Mar 28, 2016 11:08pm | #2

    The stone should be able to take the vertical load, but I'd want the framing to take any thrust.

  3. wmheinz | Mar 29, 2016 01:29am | #3

    veneer is not structural

    in general, stone or brick veneers are not structural.  I think you're going to need the help of an engineer familiar with residential construction to help out.  In addition to a ledger, you're going to have problems with flashing the shed roof where it meets the rock veneer.

    If it were me, I would remove the rock at the ledger location and install 3 2x_ treated ledgers bolted to the wall sheathing and wall framing.  That would bring the face of the ledger out 4 1/2" from the face if the stud wall .  The point where the rafters attach to the ledger will be close to the surface of the rock.  If the ledger is taller than the rafters and the roofing, you should aslo have enough space to also get a metal flashing between the rock veneer and the ledger and over the roofing material.  The ledger board could be a tall as 2x12's, depending on the height of the roofing material and the height & slope of the rafters.  It's possible to do this all with fabricated steel combined with a wood ledger as well...

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