Texture of drawing

[majorjack]

Hey, I'm looking to recreate the texture of this floor plan and its surroundings. I've had a few attempts at applying the texture through 'Pattern Overlay', though i'm not sure which blend mode to use? Or altogether if there's another way to achieve the texture? The aim is for it to be very light so it doesn't detract from the main plan of the building. Any suggestions please post, will be greatly appreciated

 

[Vetoed]

Add the layer and set the blend mode to screen probably and then lower the opacity

 

[majorjack]

bump..

 

[chrisix]

vetoed already answered your question right?
take a black and white paper texture image, and play with the blend mode
or just make a black and white texture image with a grunge brush and play with the blend mode