Mike,

 

The prep of the ground upon which the hangar is built is crucial.  Make sure there is a good vapor barrier betwixt the ground and the slab.  Consider if you will have hydraulic pressure issues because of surrounding ground if that ground is at a higher level.  Consider french drains to storm drains in order to keep land under pavement relatively well drained.  Consider a concrete apron (4'-8' ) between the hangar floor and the asphalt ramp as a heated hangar has peculiar properties up to about 15 inches from the slab because of hangar heating induced probllems (freeze - thaw cycles are brutal near the heated hangar.  Consider adequate overhang (eaves) of the roof because of melting snow/ice that will befoul the area below the drip line and in front of the door..  Consider a gutter just in the area above the man-door.

 

Consider the angle from the door to the ramp for drainage and the ability to roll the airplane in - but note that areas to the side of where the plane will roll can be steeper to take water away.  ETC.  Remember that asphalt allows water to penetrate.  Water is the bane and an enigma wrapped up inside a puzzle.

 

How do I know?  I am a consultant that helps operate Sky Haven - www.skyhaven.com

 

Scott Krueger

 

 

Listers,

 

This may seem like a random question, but potentially I am building a hangar on a lot that has a water drainage issue with taxiway runoff.  The building needs to be elevated, not a big deal, but that slopes the apron leading to the taxiway.  Does anyone know if there’s a code value for the slope, i.e. a 1% grade, or some other rule of thumb as to what may constitute too steep of a grade, i.e., so steep that pushing the plane up would be too much or so steep the plane would roll uncontrollable down if one is moving it by hand?  Any insights would be appreciated.

 

Michael Smith