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Question DetailsAsked on 11/8/2017

How many linear feet of plastic guttering would I need for a 1200 square foot single story ranch home?

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1 Answer


The square footage has nothing to do with it. Depends on the length of the downslope edges othe roof (the edges water would run down to and off) including any dormers or door protecting shed roofs getting gutters- typically I like to extend the gutters past the corner of the roofing material to catch the water running off that corner, which can run off at an angle in wind - so typically I extend the gutters cantilevered out 3-4 inches past the end of the fascia board so it catches this corner runoff too. Usually the downspout goes at the house corner so that leaves a foot or two extension past that to catch the roof corner drip (which at times can be quite a flow).

For instance, if your house were a 30x40 feet rectangle = 1200SF, but could be about 61 or 81 feet total depending on which dimension the eaves are at. But if the house were a shotgun house, say 60' long (the eave length) by 20' wide still 1200SF, but the gutter would then be about 121' feet in total length, give or take a bit. That length would be the total - so if you want an exact amount (no left over gutter material) you need to subtract the portion of gutter eliminated by the junction pieces and the downspout pieces - those dimensions would depend on the brand, but normally you would buy enough for the full eave length (not counting overhang) and end up with a bit left over (which makes good downspout runout trays). [NOTE - the above sample dimension would be the ROOF eave length - which is typically a couple to three feet beyond the end of the house on each end, so be sure you are measuring roof edge length plus any extension past the corner of the roofing, NOT the length of the house wall.]

Don't forget mounting brackets (I space at 1' spacing rather than 2' in heavy icicling areas, with alternating mounting screws just in the fascia rather than penetrating well into the end of the rafters which arenormally at 24" spacing), long galvanized wood screws for the bracket to fascia mounting (I don't remember if #8 or #10 for Genova - I seem to remember #10 by about 2" into 2x fascia, #10 by 4" if into ends of rafters at rafter spacing, as I recall - check your fascia thickness and the penetration thickness of the bracket. And joining pieces, end caps, gaskets (end caps and joining/downspout adapters should come with them but get a few spares while you cann find them),, downspouts (including any needed angle fittings because uyou usually angle 45 degrees from the downspout adapter backto the corner of the house, then another 445 to run down the edge of the walls, then 45 again out at the bottom - avoid 90's if at allpossible as they clog easily), downspout brackets and screws, gutter splash blocks if needed, and if going into a drain pipe at the bottom (typically 4" drain field pipe) to downspout adapter fittings as needed.

My preferred brand is Genova RainGo- you can see all the fittings on Amazon - available there though cannot get the 10' lengths of gutter and downspout because of shipping length so probably better to get it all at local lumberyard or building supply store. Cuts with any wood cutting saw (though does dull more than wood). If using RainGo their website has measuring and installation instructions.

Answered 3 years ago by LCD

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