A spiders web is made of two types of silk, one sticky and the other not. The spider begins the web with the non sticky silk and forms the "spokes". After the frame is constructed and secure, the spider es back with the sticky silk and completes the web design we are so familiar with, connecting spoke to spoke. They will also add rows connecting the spokes to allow them access for web maintenance. Spend time watching a spider and you will see that they painstakingly avoid the sticky silk and walk on the spokes. Should the spider be startled and walk in the sticky silk it will affix to the spider the same as it would you or any thing else. Spiders recycle their webbing, so a spider that gets stuck in its own web may eat its way out.