This is going to be 'too much information' but, it'll illustrate various things about wooden berms.Sorry, noob question. I'd like to add a small wooden berm to a tiny backyard trail. How are these usually framed if using 2x lumber--where does the curve come from? How are the joints/transitions between framing sections smoothed out? Thanks for any help!
Sorry for the thread derailment, but what trail is this on? Is this at Shanahan, or St. Raymond Sector?...
This is a overpass we built 2 weeks ago. 6 layers of 1x5 glue-laminated create the 4 main beams. 4 layers for the ramp.
Climb trail goes under, over is the beginning of the jump line. The roll-in gives the exact speed to clear the line of 20-24ft tabletop and hip jumps.
Trail is located in Vallée Bras du Nord, Quebec.
any tips for making those cuts, besides practice and a decent saw?
Straight lumber can be used to approximate a curve with multiple stringers joined at posts/piers aligned radially from a center point. You'll need 5-6 piers per 90deg of turn arc to make a pretty smooth transition between sections of decking but you'll never completely get rid of the transitions. More piers gets closer to approximating a true curve but with diminishing returns and much more labor. There are many images showing the framing layout for these structures out there if you image search for "wood berm framing". Making a small model out of craft wood & hot glue can help visualize how it all fits together as well.
This is one of the simplest 2x wood berm framing methods I've seen:
View attachment 1142360
I designed/helped build three curved wooden berms a few years ago and we used resawn treated 2x4 material to laminate curved beams for the deck attachment structure and steam bent oak boards for the decking. Tons of work, but as close to a curved berm as you can get.
More images from the project here.
Shaky POV video from this section of trail here.
agreed, that is really slick!Wow!!!!!!!!
The only other one I've seen with curved surface planks like that is Mammoth. Mammoth Mountain Bike Park In California Opens This Weekend