Dome calculator | Flex-Ability Concepts|The Curved Wall People

Dome Worksheet Using Flex-C Trac

User Input Area

Dome Height cannot be more than one half the Dome Span.
Step 1	Dome Span (in.): For Domes with requirements of greater than 20 foot span or 20 psf loading please contact Flex-Ability Concepts.
Step 2	Dome Height (in.): Dome Height cannot be more than one half the Dome Span.
Step 3	Choose Track Type: Click on drop down box and indicate the track type you have chosen. Note load capacity and choose accordingly.
Step 4	Choose Nominal Rib Spacing (in.): Click on drop down box and indicate the nominal rib spacing you have chosen, i.e. 12.
Step 5	Note Loading Capacity (psf):	Confirm that the load capacity of your selection is sufficient for the dome loading requirement.
Step 6	Print Flex-C Trac Dome Information Sheet	Loading capacity is computed for framing only with no contribution from sheathing/skin.

Track Type

Flex-C Trac 3 5/8" - 20 Ga.

Flex-C Trac 3 5/8" - 18 Ga.

Flex-C Trac 3 5/8" - 16 Ga.

Nominal Rib Spacing (in.)

Actual Rib Spacing (in.)

Load Capacity (psf)

Number of Ribs

Length of Each Rib (in.)

Circum. of Tension Ring (in.)

"X" Indicates Track Type Chosen

Track Type

Flex-C Trac 6" - 20 Ga.

Flex-C Trac 6" - 18 Ga.

Flex-C Trac 6" - 16 Ga.

Nominal Rib Spacing (in.)

Actual Rib Spacing (in.)

Load Capacity (psf)

Number of Ribs

Length of Each Rib (in.)

Circum. of Tension Ring (in.)

"X" Indicates Track Type Chosen

Flex-C Trac Dome
Dome Information and Material Sheet

Error in User Input Area

Flex-C Trac Dome
Dome Information and Material Sheet

	Dome Dimensions		Est. Weight of Completed Dome (lbs.)
	Dome Span (in.):
	Dome Height (in.):
	Load Capacity (psf.)**:

	Ribs
	Material Type:
	Number of Ribs:		Make half right and half left facing flanges to allow nesting at top.
	Length of Each Rib (in.):		Measured along the outside flange of the rib.***
	Radius of Each Rib (in.):		Outside radius.
	Nominal Rib Spacing (in.):
	Actual Rib Spacing (in.):

	Clips****		Use one clip per 18 or 16 Flex-C Trac Rib to attach to the tension ring.

	Compression Ring
	Material Type:

	No. of links:
	Ring Inside Radius:

	Tension Ring
	Material Type:
	No. of 10' Pcs. Needed:
	Ring Outside Radius (in.):

	Circumference (in.):

	Assembly Steps
	Step 1 Shape and secure* rib pieces.
	Step 2 Construct compression ring.
	Step 3 Shape and secure* tension ring pieces, construct tension ring.
	Step 4 Place three ribs in compression ring and tension ring equal distance apart.
	Step 5 Fill in remaining ribs into all three sections.
	Step 6 Check that all components are fastened securely.
	Step 7 Install dome into place and sheathe.
	* Refer to Flex-Ability Concepts dome drawings DD2-DD9 for instructions regarding fabrication, securing, and assembly of dome components.
	** Refer to the letter Experimental Study of Flex-C Trac for Dome Applications by Roger LaBoube/Structural. Engineering dated: 6/29/10.
	*** If using 20 ga. Flex-C Trac add 1 1/8" extra of web length to fold over (for use as a clip when attaching to the tension ring.)
	**** Clips - Use Simpson Strong-Tie angle clip ML24 or equal.

Disclaimers: Temporary support or bracing systems are required whenever an element or assembly is not or has not reached a state of completion so that it is stable and/or of adequate strength to support it's self-weight and imposed loads. It is important that individual dome Flex-C Trac members be installed plumb and straight. The Flex-C Trac web element must be installed in a vertical orientation. The tension ring of the completed and installed dome must be restrained to prevent both vertical and lateral movement of the dome. Using framing materials other than those specified will invalidate stated loading capacity. Always wear protective eyewear and clothing when constructing and installing Flex-C Trac domes. Loading capacity is given for framing only with no contribution from sheathing/skin. For domes with requirements of greater than a 20’ span, greater than 20 psf loading or that require rib headers please contact Flex-Ability Concepts. Helpful hints can be found on the How To Build a Dome video, parts 1-3, by Flex-Ability Concepts.
Flex-Ability Concepts: 4000 NW 39th St, Ste B Oklahoma City, OK 73112 Tel: 866-443-3539 E-mail: info@flexabilityconcepts.com