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How to Size a Cupola

Return to Cupola Index

Take a few moments to review the information presented here to help you select the right cupola. Cupolas and Weathervanes make distinguished additions to homes or any other outdoor structure. Cupolas can be used for ventilation or a decorative accent. Most of our Cupolas are purchased as decorative accents.
A good rule of thumb in selecting the right size cupola is one and one quarter inch of cupola roof for every foot of unbroken roofline. The key is the unbroken roofline measurement.

For example: 1.25” of cupola roof x 24’ unbroken roof line = the minimum cupola roof of 30”. Our experience tells us this formula provides a balance between the cupola and the roof. If the cupola is too small it will look like a birdhouse. In fact, we recommend going one size larger, especially if there is significant height to the structure, or adjoining building.

Your Roof Line

Cupola Size   Your Roof Line Cupola Size

up to 12 feet
13 to 15 feet
16 to 18 feet
19 to 20 feet
21 to 24 feet

18 inches or larger
22 inches or larger
26 inches or larger
30 inches or larger
36 inches or larger

  25 to 28 feet
29 to 32 feet
33 to 36 feet
over 36 feet
42 inches or larger
48 inches or larger
54 inches or larger
60 inches or 2 cupolas

For a more dramatic effect, or if a cupola larger then 60" square is needed, consider using 2 cupolas on the roof line.  When using more than 1 cupola per roof line, here is a good rule of thumb to follow: use 1 inch of cupola for every foot of unbroken roofline.  For example: if a roof section measures 24 feet, the minimum size of each cupola should  be approximately 24 inches square.

Your Roof Line

Cupola Size   Your Roof Line Cupola Size

up to 18 feet
19 to 22 feet
23 to 26 feet
27 to 30 feet
31 to 36 feet

18 inches
22 inches
26 inches
30 inches
36 inches
 

37 to 42 feet
43 to 48 feet
49 to 54 feet
55 to 60 feet

42 inches
48 inches
54 inches
60 inches or 2 cupolas

  • Wood cupolas are made from hand-selected Northern White Pine or Cypress.
  • Wood cupolas larger than 30” will come with Marine Grade Plywood, Douglas Fir base.
  • Vinyl cupolas are made from solid plank and board PVC, a material more durable than natural wood.
  • The copper tops of the cupolas are made from 16 ounce 24 gauge copper.
  • All cupolas come in 3 sections for easy delivery and installation.
  • Complete installation guide is included with every cupola.
  • Wood cupolas come unfinished and are ready for painting or staining.
  • All vinyl cupolas are maintenance free and do not need any painting or staining.
Many of our cupolas are “weathervane ready.” They do not require a roof mount or any additional hardware.

All wood and vinyl cupolas are made for a 10/12 pitch, while the Castle Cupolas are made for a steeper 12/12 pitch roof.  If steeper, an extended base can be built, if ordered at the time of ordering the cupola.

   
   
   
   
   
   

 

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