Reinforce Floor For Fireplace Insert Install

72chevy4x4

I'm going to install a direct vent fireplace framing it on the inside of an existing room. likely covering the new work in stone or brick veneer (or engineered) and a hearth (covered not 'solid' masonary). The joists are 2x10's 16" oc at 13' wide-I was considering doubleing the joists carrying the weight of the new construction all though unsure of the exact load being applied. Does this sound right?

Has anyone done a 'half in / half out' install with a direct vent fireplace? The HO originally wanted a flush install but there would not be anything to rest the new chimney framing on as it's a 2nd story install (don't want to build chimney all the way to ground). Are there other options?
thanks.

thom

There are multiple questions here so bear with me

Location of FP. It can go inside the envelope, outside the envelope or 1/2 & 1/2. The FP itself won't weigh more than the floor can support. It will weigh less than the 40# psf minimum load. The issue is the weight of the finish. If you use masonry you must engineer based on the actual load. Until you decide what the finish is, you can't engineer for it. You haven't given anywhere near enough information here for anyone to answer that question correctly.

Stone weighs a lot. Different stone weighs differently. You need to determine how much and bearing locations. Same with brick.

Supporting stone and/or brick on wood framing can result in headaches down the road. Wood moves and flexes, masonry cracks when it moves. That's why second story masonry generally is supported by masonry down to a foundation.

Creosote

4x4, What is the sq ft of new work gonna be, this can give you an idea what the whole will weigh.

Pro Fit stone on its own is about 100 lbs per 10 sq ft of coverage...

72chevy4x4

they've made it easy on me-where the mantle is, there will be a surround of tile-piece of cake

thanks for all the suggestions.