Building a Composite Deck?

Make it easy on yourself. Tell us the project specs and we'll put together a quick materials estimate.

 
Total Area:
0 Sq. Ft.

1. Enter deck dimensions:     Show me some standard sizes

2. Will your deck have railing?       How we calculate railing

12' X 12' Deck design
(144 sq. ft.)

The perfect starter size, with plenty of room for an outdoor furniture set.

Select This Size

12' X 14' Deck design
(168 sq. ft.)

A few more feet sets the scene with space for a dining table.

Select This Size

12' X 16' Deck design
(192 sq. ft.)

Room enough to break your space into zones.

Select This Size

12' X 18' Deck design
(216 sq. ft.)

Boost the ambiance with a grill or umbrella.

Select This Size

12' X 20' Deck design
(240 sq. ft.)

Open up the layout, call the neighbors and let the party begin.

Select This Size

3m X 3m Deck design
(9 sq. m.)

The perfect starter size, with plenty of room for an outdoor furniture set.

Select This Size

3m X 4m Deck design
(12 sq. m.)

A few more meters sets the scene with space for a dining table.

Select This Size

3m X 5m Deck design
(15 sq. m.)

Room enough to break your space into zones.

Select This Size

3m X 6m Deck design
(18 sq. m.)

Boost the ambiance with a grill or umbrella.

Select This Size

3m X 7m Deck design
(21 sq. m.)

Open up the layout, call the neighbors and let the party begin.

Select This Size

Calculating Railing

One side of your deck borders your home. To keep things simple, we approximate railing materials needed for the remaining sides.

Deck Estimate

 = In-Stock  

 Decking: 0 Sq. ft

 Railing: 0 Ln. ft.

Decking Materials

Choose from 8, 12, 16 or 20 ft board lengths. Choose which board best fits the dimensions of the deck. Make sure to order one square edge board for the outer edge of your deck.

Calculations provided for boards installed at a 90-degree angle. If laying boards on an angle, an approximate increase of 15% may be required.

Board Length Boards Required
 8 ft   
12 ft   
16 ft   
20 ft

Railing Materials

Choose from 6-ft or 8-ft railing lengths.

Railing section size (on center) Number of sections required Number of posts, caps, skirts required per section
6ft (67.5-in — 72-in) 
8 ft (91.5-in — 96-in)

Trex offers a variety of different railing lengths: Trex Transcend® and Trex Select® railing are available in 67.5-in and 91.5-in lengths, Trex Signature® railing is available in 72-in and 96-in lengths and Trex Enhance® railing is available in 72-in length. Trex Enhance Railing is on-shelf in select stores. Customers may prefer railing posts in a different location that may then affect the railing lengths and number of sections required.

Trex Hidden Fasteners

Both clips and fasteners are required.

Combination packs Quantity required
Trex Universal 50-sq ft Coverage Black Clip Hidden Fasteners 
Trex Universal 200-sq ft Coverage Black Clip Hidden Fasteners 

Calculations provided for boards installed at a 90-degree angle. If laying boards on an angle, an approximate increase of 15% may be required.

The above estimate is for comparison purposes and does not account for substructure or labor. Square footage may vary depending on the placement of stairs, curves or additional features. Because all decks are custom-built, every project requires a personalized estimate.

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