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
Colour
Brown
Material
Plastic
Mattress Thickness
11.44 Inches

🚪Independent pet access anytime

🛠️Easy DIY installation

🛡️Durable heavy-duty frame

Description

🚪 Unlock your pet’s freedom with style and strength!

BREATHE EASY STAY SECURE - Enjoy fresh air and natural light without compromising your pet’s safety or your home’s security.
TRUSTED BY PET LOVERS WORLDWIDE - Backed by 25 years of innovation and expert support, join a global community that prioritizes pet happiness.
EFFORTLESS SETUP INSTANT UPGRADE - Quick dual sliding locks make installation a breeze—no professional help needed, just seamless integration.
BUILT TO LAST DESIGNED TO IMPRESS - Heavy-duty metal and tear-resistant mesh ensure long-lasting durability while maintaining a sleek bronze finish.
FREEDOM AT YOUR PETS FINGERTIPS - Let your furry friends come and go without limits, enhancing their independence and your peace of mind.

The PetSafe Pet Screen Door in bronze offers a durable, easy-to-install pet door solution featuring a heavy-duty metal and plastic frame with tear-resistant mesh. Designed for pets up to 30 pounds, it provides independent access through porch or window screens with secure dual sliding locks. Trusted for over 25 years, this product blends functionality with sleek design to keep your pets safe while letting fresh air in.

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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