If you’re building a new deck here is a chart your going to need. Remember this is just a reference tool and an engineer should always being consulted before construction.

ToolBase Services is the housing industry’s resource for technical information
on building products, materials, new technologies, business management, and
housing systems. This is a really informative site and I encourage you to check it out.

This Old House has created the Web’s definitive guide to restoration and home improvement suppliers & manufacturers.
Here you’ll find information on thousands of companies offering countless products and services to old-house
  owners and restoration pros. If you are restoring a home, click here to find the products you need.

I found this website which could really help when building a new home, remodeling or just changing things up around the house.

Buying a new home, rearranging your room, or moving into a new office?
You can save time and have more fun if you lay out your ideas ahead of
time.

    Floorplanner is FREE for personal use, their PLUS account offers more space if you need it.

Google SketchUp 6 is a free, easy-to-learn 3D modeling tool that
enables you to explore the world in 3D. With just a few simple tools,
you can create 3D models of houses, sheds, decks, home additions,
woodworking projects – even space ships. And once you’ve built your
models, you can place them in Google Earth, post them to the 3D
Warehouse. Hey, could this be the end of drawings on napkins?