CDX plywood is used under shingles and roofing felt, on walls (just behind the siding and insulation), and as a sub floor. I've used it for creating rough shelving in a basement or garage, and it works fairly well for those kinds of projects where function is more important than appearance.
CDX Refers To The Grade Of The Sheet, One Side Is "C" While Other Is "D" Meaning It Will Have Imperfections And Knots Visible With Football Shaped Plugs. "X" Refers To The Glue Used Which Is Stronger And May Be Exposed To Weathering For Short Periods During Repairs
Application: ceilings, wall linings, furniture, substrates and hoardings.

Specification:

1) Size: 1200x2400mm
2) Thickness:  7mm, 9mm, 12mm, 15mm, 18mm or requested 
3) Core: Radiate Pine  
4) Face/back:  C/D grade radiata pine face and back 
5) Density: 540~600 kg/m3  
6) Glue: waterproof WBP glue 

Contact person: Nancy Chang  

Mobil/Whatsapp/Wechat: +86 15266695378

Email: nancychang123(at)126.com

Skype: nancychang80