SLOPING AND BENCHING SYSTEMS
Cutback distance (H) = .75 x Depth (V) Steepest Actual Slope Cutback distance (H) = 1.25 x Depth (V) For combination slope/bench systems in TYPE A soil and a trench depth of less than 20 feet, the steepest maximum allowable slope is 53 degrees from the horizontal.
Must-have measurements for comfortable seating | WOOD Magazine
Keep in mind, though, that as the back angle increases, you need to up the seat angle (to maintain the seat-to-back angle between 90° and 100°) to prevent forward sliding and lower the seat height to keep the front edge of the seat from contacting the back of the legs.
Proper Angle for Incline Bench Press | Livestrong.com
Explore Incline Bench Press Angles In addition to targeting slightly different muscles, the incline bench press tends to go easier on the lower back than the flat bench, as the inclined angle supports the lumbar region. Similarly, being on an incline makes you less likely to arch your back as you press up, which a bad benching habit to get into.
Reference: Common Dimensions, Angles and Heights for Seating .
Reference: Common Dimensions, Angles and Heights for Seating Designers If you're designing a chair, sofa, stool, bench, booth or banquette, start here By Rain Noe - November 25, 2015
furniture - What is an ideal angle for a seat back piece .
15 degrees is good for the back angle, BUT you should also slope the seat base down towards the back 5 degrees also. This stops people sliding forwards when they lean back and maintains the ideal 100 degree angle for lounging. Michaels last point is extremely good advice. I did exactly that at IKEA and learned a lot.
Building Benches For Your Deck.You can do It!
An ideal slope for a backrest is about 5 degrees, maybe a bit more. Beyond 10 degrees and it will start looking and feeling like an Adirondack Chair, without the comfort so don’t bother. Wood is inherently hard and uncomfortable for sitting on over long periods of time. So these building tips will alleviate that a bit.
Dimensions for Outdoor Benches | Hunker
If you want an outdoor bench with a back, the back should extend at least 16 inches above the top of the seat. The backs can be perpendicular to the seat or slightly sloped backward. Keep the slope gentle; about 5 degrees is typically enough for added comfort.