Replies

1. 
   john7g | Oct 04, 2006 08:48pm | #1

   straight header across the top & then back fill with nailers & plywood back down to your arch.

2. 
   Framer | Oct 04, 2006 09:06pm | #2

   Here's a drawing. Hope this helps.

   Joe Carola
3. 
   Piffin | Oct 04, 2006 09:49pm | #3

   That depends on the size and radius.

   Generally I don't use a true structural arch. I place a header perusual elevated to the top of the arch RO, then pack down .

   one way of packing it is to build an arched filler with plywood and blocks.

   That means I would drawe trhe arch RO out on a sheet of 1/2" or 5/8", and cut out two pieces of it. Then, assuming a 3-1/2" frame and 1/2" playwood, rip up a bunch of scrap two by blocks 2-1/2" to fasten the two "bread slices" apart all along the curved edge. This is fastened into the space and provides nailing for the exterior sheathing, the interior SR, and the insulation between. Same way for interior arches, the SR bead can follow the corner and have nailing

    

    

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4. 
   Stilletto | Oct 05, 2006 12:51am | #4

   I frame the RO as usual to fit height and width,  the header is 2-2x nailed together and flush with the outside,  leaving the inside of the header a 1/2" inside the studs. 

   Then when the window shows up I lay it flat and use a 3/8" washer and pencil to scribe the window profile onto the interior sheathing.  Cut it out with a jigsaw.  Make a cardboard template of your sheathing arch,  the cardboard the window comes in.  And cut out your exterior sheathing. 

   I measure 6" if possible from the top of the window to the top of the sheet,  that 6" will overlap onto the header on the inside.  Then I cut my 3" blocks to fit in between the interior and exterior sheathing.   Then staple a piece of Tyvek or insulmesh over the bottom of your framed arch,  so the header can have insulation blown in after the window is in.   

    

    

1. 
   PlaneWood | Oct 06, 2006 01:30am | #5

   Thanks people!  Figured it was something pretty simple.

   PlaneWood by Mike_in_Katy (maker of fine sawdust!)PlaneWood