lower glazing bead for timber window

[thelastgizmo]

I have just received a set of timber windows for my mums house and the lower piece of beading used to fix the glass in is deeper (front to back) than the other three pieces by about 9 mm. The window company says that this is to stop water seeping back under the beading and thus compromising the double glazing unit. Is this standard practice or just wishful thinking? The underside of the beading does not have a drip grove in as on the underside of a sill. Would I be best to route a grove in this piece or to trim it to the same depth as the other pieces thus making the front of the beading flush with the frame. That way I can paint over the joint and see if there are any gaps.

Any advice gratefully received.

Steve

 

[God]

It is correct, fitted loads of beading like it

 

[crank39]

As God says its quite normal, its deeper so it forms an over hang just like a cill, one thing to check is that the bottom rail where the bead sits has 2 groves running from the front to the back of the rebate, this allows a drainage route for water to drip out instead of collecting under the dgu and trapped by the bead in question, no all timber window manufacturers incorparate this

 

[thelastgizmo]

Thanks for the info. I have routed a slot under the bead anyway. Can't do any harm.

Crank39, I believe my frames don't have these groves front to back (they're not here with me at the moment). What sort of dimensions would they need to be? I'll hand cut them before I put the frame in.

 

[crank39]

About an 1/8" wide and the same deep, whenever i fitted timber windows (normally Magnet) i used a drill bit on its side and pressed down on it

 

[God]

I think the beads are meant to sit on a rubber block so the water drains away

 

[crank39]

I think the beads are meant to sit on a rubber block so the water drains away

That'd be one way