Smooth 4 inch diameter plastic sdr 35 sewer pipe is the material i prefer to use.
My gutters go into 4 inch pvc.
There will be a total of 4 downspouts merging into the same line.
Roof area the locale s rainfall intensity and gutter capacity determine how many square inches of downspout are needed.
I don t think that side of the home has of 2k square feet of roof at the most.
Doubling the number of downspouts halves the required capacity for each.
I used 4 pvc and fittings because it was readily available but any size would potentially work.
Run water into the gutter at the top of the.
How many downspouts can i run into a single 4 pvc.
Once the pvc was glued i set it in the trench.
This pipe has a smooth interior and closely resembles the thick walled plastic piping used for interior house drain and vent piping.
Fittings can be permanently welded to the pipe with pvc cement.
Wipe pvc glue using its applicator around the outside and.
Allowing your roof water to simply discharge onto and into the soil around your house is a big mistake.
I m thinking 4 should be sufficient.
Then use the information below to see what size gutter you need.
And topsites i do agree.
I used a 3 4 stepdown coupling on the end of the pvc and put my black corrugated pipe around the 3 inch end.
The rainfall that falls on an average roof can be tremendous.
It connects fairly well so the backfill was enough to hold that in to place.
I plan on burying my downspouts and having them merge into one 4 drain pipe.
Fasten a piece of pvc 45 degree angle joint to one end of a piece of eight to 10 foot long 4 inch diameter plastic sdr 35 sewer pipe.
A typical house in the chicago area can have in excess of 50 000 gallons of water fall on the roof in just one year.
A square inch of downspout can drain 1 200 square feet of roof during a rain with an intensity of one inch per hour.
The discharge will be at a nice point far from my house.
Size downspouts to fit the gutter.
If a roof s various drainage areas call for different size gutters go for the biggest one k style.
There should be no more than a inch drop in the direction of the downspout.
If it looks like the gutter is loose check the gutter fasteners.
By connecting a series of pvc pipes underground and hooking them up to your gutter system you can divert the water away from the home and safely into a designated area.
Multiply the drainage area by the roof pitch factor and rainfall intensity to find out the adjusted square footage.
My roof in cincinnati will capture about 145 000 gallons this year.
The length will be about 200 ft from the first downspout to the discharge.
