add wooden beams..... usually in all roof, there is a 12" gap between wooden beams. so if u add another in between those 2 beams, the gap will be shorten to 6". ppl cant get in. ive added additional wooden beams already to my house. feel safer la... cause if ur out on a business trip and ur wife or gf only one at home.... those indon frens come from the top, then wut will happen? take things nevermind... if they hurt ur wife/gf cialat man.... local girls does look and taste better. prevention better than cure my frens..... price range is bout Rm1.5k-RM3k depending on how big is the house. but u better make sure ur house got no termites on the roof first b4 u do it. usually the contractor will check for u. if got termites they wont do wan.... ask u settle those ants first....normally la....

metal piece is also good... 100% secure but then sunny day, ur house will be like an oven! no need la.... very very much more expensive than wooden beam. price range is bout RM4k-7k or more....

but bear in mind, if ur house is still under warrantly from the developer and u do this adding beam thingy, ur roof warranty will be gone. meaning if roof leaking, u need to find back ur contractor which does the wood adding for u. developer wont cover... they got spies... alot of them... when i did mine, the developer contractor came n take pictures of my personal contractor doing my roof. its their proof... so cannot argue if have leaks. smart @ss....