Your greenhouse looks much more eye pleasing than the kits offered by the big box stores. Thankyou for the instructions

I have been building these for years . A few things I have learned .the chord length will deflect a maximum of 1/6 of itself. That is a 12 foot length will support an arch that is 2 feet deep,soaking the material in water or hot water aids in its flexibility. Wet wood can be glued with urethane construction adhesive, it sets with water. Rather than pulling a curve onto horizontally placed blocks, it uses less material and is more efficient to push the form down into risers that form the curve. I fix my blocks onto the top chord glue and air staples then push it down into the vertical risers tacking here and there with screws,no clamping necessary, then apply glue to blocks and push the inner chord down onto that assembling the truss with air construction staples. Undoing the tack screws it pops from the jig . You can expect 10 % spring back. I layout the curve as a catenary arch. This I found is the simplest tech , I could never understand the massive area and sport to construct horizontal platforms and blocking and clamps etc. A vertical form requires no platforming and can be as simple as hammering stakes in the ground.. for planning select three points one midpoint offset by 1/6 and drape a chain connecting the three, the curve formed is the layout of a catenary arch . Plan using scale grid paper transfer the measure and angles to stakes ,vertical risers, miter the tops and the form is ready to press your trusses.

You can calculate the length of the arch, it is 2πR/6 - R is your distance from A to B

This is nice easy to follow video. And the final structure is absolutely beautiful. Thanx!

You make it look easy, . Off now to see some of the other videos.

meu amigo a sua explicação foi a melhor da internet sobre arcos góticos. Fantástico.

Great job thanks for sharing your work man I love those arched buildings they are cool

Gracias, buena explicación. Saludos.

Helped a lot thank you.

Thanks man. Great video.

Excellent advice! Thank you very much!

Спасибо за подробности. Очень познавательно.

Great job thanks for all thèse explanations. Very helpful. Thomas

Awesome. Thank you

I'm currently trying to build one. Just tried my first bend with 1x2.75x10' hemlock and with a 16" bend in the center it started cracking. Just picked up some 2x4 to make a little pool to let my 1x2.75 soak and I'll give it another try. Also bought some 2x8 to make a 16"x10' platform to bend my arches. Hopefully will be all good when I have a chance to start bending in a few days!

Great job, you do such good work. I see you used cedar. Could I use 4" pine and not worry about it braking? I want to bend a 12' board. It is for the top of a 10'x20' shed

I love your videos, thank you for sharing!!! How tall is your greenhouse in the center using 10’ boards?

I would like to make small house for may horse but maybe the wood I used in test was not good! Do you say me what caind of wood have you used? Tanks vary much

What glue did you use?

Use a proper pencil for layout if you're going to do this

I do love the gothic arch and have watched several folks on how they did their arch. Most get into some serious mathematics so if that's not your thing but you want to try making an arched shed, greenhouse or whatever, please take a look at this man's method. It's what I used: kzfaq.info/get/bejne/n9yYa7F6upqZZYU.html