does it leave any crack when shut, through which roaches could come in?

No cracks and there are even magnets in the door to make sure it stays shut. The magnets are pretty powerful too. So much that my cat could barely get through and I had to demagnetize the door so she could use it. No roaches can get in unless they're like HULK roaches. And if that's the case you may have another problem on your hands.

the bottom half of my screen door is thin aluminum, would this work for it as well?

I also have an aluminum panel in the lower part of the screen and have used this car door. I cut a piece out to the same size as the inside of the door frame. Drill the frame holes in the aluminum and without taking the cat door apart, use SS bolts thru the frame and secure it on the outside of the aluminum door panel with cap nuts. The bolts must be shortened if the cap nuts do not tighten against the panel. I never had a problem with the door after installation.

Does it come with a lock? In case you want to keep your pet outside for some reason?

If your cat wants in, it will just claw the screen and tear it open and come on in. Screen in door isn't very strong.

It that fit for a median dog, weight about 30 lb?

I think 30 pounds is too big. I use it for two cats. One cat weighs 7-8 pounds and the other cat weighs 5 pounds and it is perfect for them. You would need a much larger door. You have to use reinforcement bars to make it sturdy especially with a dog. Maybe this one is a better fit:http://www.amazon.com/Gate-Way-Pet-Door-Screens/dp/B0018C7ZRU/ref=sr_1_1?s=pet-supplies&ie=UTF8&qid=1396423804&sr=1-1&keywords=screen+door+mediumPlease look at the pictures I posted for the reinforcement. Pictures 2,3,4,5 & 8 are of our door installed. I posted notes on two of the pictures. Before installing, pick up Heavy Duty Pet Mesh and add two layers to make door much stronger. I hope this helps!http://www.amazon.com/gp/customer-media/product-gallery/B00023N7TG/ref=cm_cr_dp_cust_img_see_all_img1

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PetSafe Pet Screen Door, Bronze

Product ID: 230996035

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Details

Size
Small (Pack of
Brand
PetSafe
Color
Brown
Material
Plastic
Mattress Thickness
11.44 Inches

🐾30 lb weight limit

🔒Secure sliding locks

🛠️Easy snap installation

Description

🐶 Let them roam free with style!

SAFETY FIRST - Equipped with dual sliding locks to keep your pets secure while allowing easy access.
DURABLE DESIGN - Crafted with high-impact plastic and tear-resistant mesh to withstand your pet's playful antics.
PERFECTLY SIZED - Designed for pets under 30 pounds, ensuring a snug fit for your furry companions.
HASSLE FREE INSTALLATION - Snap it into your existing screen door or window in minutes—no tools required!
FREEDOM FOR FURRY FRIENDS - Encourage exercise and independence with a pet door that lets them come and go as they please!

The PetSafe Pet Screen Door in Bronze is a durable, easy-to-install solution for pet owners, allowing cats and small dogs under 30 pounds to enjoy the freedom of going in and out without assistance. With a secure locking mechanism and a robust design, this pet door is perfect for encouraging exercise and independence while ensuring safety.

Specifications

Closure Type	Snap
Weight Limit	30 Pounds
Frame Material	Metal,Plastic
UPC	081208302004
Global Trade Identification Number	00081208302004
Department	Pet Supplies
Manufacturer	Pet Access
Item model number	P1-ZB-11
Product Dimensions	33.02 x 1.91 x 24.77 cm; 340.19 g
ASIN	B00023N7TG

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