Here's what you need:
- 1 inch thick foam board insulation (for this project, I actually prefer the cheaper white stuff. I like the way it come apart, tears, etc. The amount and size you need depends on how many windows you want to "board up")
- A serrated knife of some sort (a regular steak knife can do the trick)
- A flat head screwdriver or similar tipped item
- Mouse sander (optional)
- Brown latex paint (if you have a paint sprayer, it will make this a lot easier because you need to reach lots of nooks and crannies)
- Gray latex paint (A cheap paint brush is used with this)
- Hot glue (double sided duct tape or velcro could also be used)
- Duct tape (regular or double sided)
- tape measure
Step 1: Take Some Measurements
The other boards that will be attached to the diagonal board don't necessarily need to go past the window. As you can see in the first picture, some do and some don't. This gives the appearance that some of the boards may have broken or whoever put them up just used whatever they had laying around.
Step 2: Cutting and Shaping the Foam Board
Next, cut all the boards you will need for your window. You can cut them curvy, straight, or however you like. I wanted mine to look like old boards that were laying around for years before being put on the windows, not something that just came from the local hardware store.
The next step would be to use your fingers, knife, screwdriver, and mouse sander (use the tip or side of the sander) to rough up the ends and edges of the board.
Step 3: Making It Look Like Wood
Then, use a little more pressure and drag the screwdriver through the foam. This will make the wood look rotted and brittle after it's painted. Try different techniques. I use the white foam board because of how it looks in this step.
I also like to use the point of the mouse sander to create areas where maybe a knot in the wood fell out. I can't stress enough to just try different things.
Step 4: Painting
You can paint the boards with a brush, but it's very important that all the gouges and cracks you made get colored with the brown paint. I suggest using a paint sprayer if you have one.
After the boards are dry, you are now ready to use the gray paint. For this, you are going to dry brush (remove most of the paint from the brush) the gray paint over various areas on the surface of the board (not in the cracks). This will really bring out the gouges and cracks as well as make the boards look older.
Step 5: Attach the Boards
Now, all you need to do is put a few pieces of looped duct tape or double sided duct tape on your diagonal board and stick it to your window.
In the second photo, you can see there is a border around my front windows that juts out. If you need to, attach a piece of foam to the back of your board and then duct tape it to the window. I needed to use a piece that was a couple inches thick.
That's it! Now, you can put some cobwebs on them or whatever.
Another cool effect (not pictured) is to buy some cheap plastic table cloths (white and black). Shred and tear the white ones and attach them inside your house to look like curtains. Then cover the entire inside of your window(s) with the black table cloths.