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Question DetailsAsked on 1/16/2017

cost to install eave boxes on a flat roof

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2 Answers



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Answered 3 years ago by Member Services


Assuming you mean eave box gutters, not eave bird boxes or decorative eave returns.

Depends on the design of course - simple aluminum box gutter type probably about $6-8/LF in most areas (assuming doing full house at one time, so at least around 80-100LF or there abouts), fully wood enclosed type likely starting around $10/LF and up to $15-20/LF depending on fanciness (i.e. some are faced wtih fancy molding or gingerbread decoration) and type of wood used, the higher end of course for redwood and ipe and such for their moisture resistance.

My recommendation - other than for architects to wise up and totally avoid designing/building houses without roof overhangs, is to avoid the enclosed box because that just traps moisture in the eave area and promotes rot - use good quality dripedge on the roof itself to keep the water away from the siding, extending a bit down into the eave box - and the more open to the air it is at the front edge the better, not only for moisture reduction but also for cleaning, and also for catching runoff from any roof edge icing. And require spacing away from the house (typically 1/2" is enough) so there is no contact with the siding or fascia (other than the hangers), so if there is overflow due to blockage it hopefully will run off down the back side of the eave box and drip off to the ground rather than running down and saturating the siding.

Also - if using the box rathear than gutter shape, it is typically a lot deeper than a normal gutter so weighs 50-100% more if iced up or full of leaves, so I recommend using 12-16" hanger spacing for them instead of the more typical 24" spacing used on overhanging roof gutters.

Oh - and one other thing very few installers do but should be on their must-do list. The box should be either tilt slightly forward or be fabricated with the front edge a 1/4" or so lower than the back edge, so if it does fill up with debris or ice up it will hopefully run over the front rather than fill up and run/ice over the back, wetting the house and the ends of the roof joists/rafters. Running over the front also visually alerts you to the fact it is blocked - if the water runs down the siding (especially during rainfall) that water might not be noticeable before your wall is wet inside or the siding starts deteriorating or forming a mold cascade down it. That overflow risk is also the reason for the standoff at the back of the gutter.

Answered 3 years ago by LCD

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